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Sunnybay organic lava sand heat pack microwavable
Sunnybay organic lava sand heat pack microwavable
Sunnybay organic lava sand heat pack microwavable
Sunnybay organic lava sand heat pack microwavable
Sunnybay organic lava sand heat pack microwavable
Sunnybay organic lava sand heat pack microwavable

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USA-Made 4-lbs Lava Sand Microwave Heating Pad for Period Cramps or Body Back Soreness, Superior Heat Retention and Lasting Action, Washable, Odorless, Weighted Sandbag, 8x12 Inches

Regular price $89.99 Sale price$59.99
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Shipping calculated at checkout.

Made in the USA Product. Lava Sand is mined in Utah and handmade in America. This heat pack is heavy and have long-lasting heat. More effective for heat therapy.

Relieves neck & shoulder tension

Use hot or cold anytime

Reusable, long-lasting heat

Quick microwave warm-up

Free Shipping on orders $50+ • 30-Day Easy Returns

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Dry Eye Therapy Eye Mask, Reusable Microwavable Odorless Heat Therapy, Purple Dry Eye Therapy Eye Mask, Reusable Microwavable Odorless Heat Therapy, Purple

Dry Eye Therapy Eye Mask, Reusable Microwavable Odorless Heat Therapy, Purple

$29.98

Microwavable Heat Wrap with Fastening Elastic Band (Purple) Microwavable Heat Wrap with Fastening Elastic Band (Purple)

Microwavable Heat Wrap with Fastening Elastic Band (Purple)

$29.99

Drug-free Whole Body Relief: There’s no limit to the uses of our lava sand microwavable heating pad. For neck, shoulder, and back soreness, period cramps, joint stiffness, or cysts, use warm over the affected areas. Use frozen for sports injuries, swelling, or acute soreness. Melt away stress, ease tense muscles, and warm cold feet – you get the idea!
Dual Hot/Cold Action: Thanks to lava sand’s excellent responsiveness to hot and cold, you can use the sand bag as an ice pack as well as a back, neck, and shoulder heating pad. Microwavable and freezable, it’s ready within 1.5 to 2.5 minutes in the microwave or when frozen for a couple of hours.
Soothing 4-pound Weight: Combining the healing effects of compression and thermotherapy, our heat pack has a penetrative effect that targets structures deep under your skin. The dense weight provides pressure to aching body parts, aiming for instant relief while boosting permanent recovery.
Superior Heat Retention: Ultra-rare locally mined lava sand filling from Utah, USA, makes our hot pack for tension relief stand out from the rest. Releasing heat much slower and for longer than traditional filling materials once microwaved, its lasting action is complemented by the stitched chamber design that keeps the sand in place for even heat distribution.
Life-Time & Convenient Design: Easy to use, maintain, and carry, with the 8x12 inch dimensions providing enough coverage without adding unnecessary bulk, our warm compress can be used on the go. To clean, wash by hand or in the top rack of your dishwasher. The lava sand will last you a lifetime.

Microwave the wrap on a clean plate, flip after 1.5 minutes, and then add 1 more minute. The pack may be moist and take time to heat up initially. This will all improve after repeated use.
Drape it over the neck, shoulder, tummy, back, arm, leg, or anywhere that needs attention. Use directly against the skin for better heat benefit.
Do not exceed 3 minutes of total heating time.
Freeze in a plastic bag for 2 hours.
How to clean: hand wash the entire heat pack. You may put it in the top drawer of a dishwasher.


Size 12" x 8" x 2".
Weight: 4 lbs
Fill: US-Mined Lava Sand
Fabric: 100% organic cotton
Manufactured in the USA by BioMed DB Design, LLC

Drug-free Whole Body Relief: There’s no limit to the uses of our lava sand microwavable heating pad. For neck, shoulder, and back soreness, period cramps, joint stiffness, or cysts, use warm over the affected areas. Use frozen for sports injuries, swelling, or acute soreness. Melt away stress, ease tense muscles, and warm cold feet – you get the idea!
Dual Hot/Cold Action: Thanks to lava sand’s excellent responsiveness to hot and cold, you can use the sand bag as an ice pack as well as a back, neck, and shoulder heating pad. Microwavable and freezable, it’s ready within 1.5 to 2.5 minutes in the microwave or when frozen for a couple of hours.
Soothing 4-pound Weight: Combining the healing effects of compression and thermotherapy, our heat pack has a penetrative effect that targets structures deep under your skin. The dense weight provides pressure to aching body parts, aiming for instant relief while boosting permanent recovery.
Superior Heat Retention: Ultra-rare locally mined lava sand filling from Utah, USA, makes our hot pack for tension relief stand out from the rest. Releasing heat much slower and for longer than traditional filling materials once microwaved, its lasting action is complemented by the stitched chamber design that keeps the sand in place for even heat distribution.
Life-Time & Convenient Design: Easy to use, maintain, and carry, with the 8x12 inch dimensions providing enough coverage without adding unnecessary bulk, our warm compress can be used on the go. To clean, wash by hand or in the top rack of your dishwasher. The lava sand will last you a lifetime.

Use collapsible tabs for more detailed information that will help customers make a purchasing decision.

Ex: Shipping and return policies, size guides, and other common questions.

Social Care Award for Best Therapeutic Neck & Head Pillow Provider - USA. Awarded by GHP Magazine, 2017.

Best Pain Relief Product Company 2024 - USA

Certified Minority Woman Owned Small Business

Products are Manufactured in the USA by BioMed DB Design, LLC

Our Awards

Targeted Relief Where You Need It

Relax tight muscles, ease daily stress, and enjoy comforting warmth anytime.

Stays in Place

Flexible, weighted fill molds to your body. Perfect size for your back and shoulders.

Relieves Tension & Soreness

Soothing heat helps ease back and shoulder aches from daily strain, stress, or exercise.

Natural & Lava Sand Fill

Made with US-mined lava sand, it offers long-lasting heat without gels or chemicals.

Comforting, Soft Feel

Cotton and natural lava sand filling deliver gentle, even warmth that feels instantly relaxing.

Effective Therapy

Odorless and lasting warmth speed up recovery.

Washabel, Portable & Reusable

Durable design for daily use at home, in the office, or while traveling. Chambered inner bladder ensures even heat distribution.

Stays in Place
Relieves Tension & Soreness
Natural & Lava Sand Fill
Comforting, Soft Feel
Effective Therapy
Washabel, Portable & Reusable

Long-Lasting Heat

Loved by 1M+ People

Handmade in the USA

durable design

Targeted Relief

Long-Lasting Heat

Handmade in the USA

durable design

Long-Lasting Heat

Loved by 1M+ People

Handmade in the USA

durable design

Targeted Relief

Long-Lasting Heat

Handmade in the USA

durable design

Long-Lasting Heat

Loved by 1M+ People

Handmade in the USA

durable design

Targeted Relief

Long-Lasting Heat

Handmade in the USA

durable design

Long-Lasting Heat

Loved by 1M+ People

Handmade in the USA

durable design

Targeted Relief

Long-Lasting Heat

Handmade in the USA

durable design

Long-Lasting Heat

Loved by 1M+ People

Handmade in the USA

durable design

Targeted Relief

Long-Lasting Heat

Handmade in the USA

durable design

How to Use Your Heating Wrap

1

Heat

Fold the pack in half and microwave for 1 minute; flip, then add 1 more minute. Flipping helps even heating.

2

Apply

Place on your neck or sore area. The flax-seed fill molds comfortably to your body.

3

Clean

Wash with soap by hand or in a dishwasher. Let it dry or microwave even when wet.

Helping 1M+ People Find Relief Since 2002

Perfect sized sandbag

The 4lb lava sandbag is amazing. The lava sand comes from Utah which is pretty cool. The sandbag hears extremely well and holds its heat for over 20 minutes. I've used it on shoulder pain and I love the way this sandbag is wide enough to really cover the area needing it. Great value!

Danyalle S.

I'd purchase again!

After reading lava sand, holds heat longer and better than other fillers, which, actually makes sense. I thought this would be the right product, for neck pain. Having electricity close to your brain, from electric heating pads CAN, cause other problems.It held the heat for a nice amount of time.

Wayne Longino

It's great

Fabulous

Ann Tate

Perfect for back or shoulder pain

I love that it stays hot for a long time and unlike heat packs made with rice or other such substances...this lava one doesnt get too hot and make the inside contents stink from burning.
I LOVE this heat pack!

Venetta

Versatile and Comfy!

This helps my back loosen up as well as my neck and you can tie it or just drape it. I drape it over my shoulders and neck at night while watching tv in bed with my pillow behind it and it works wonderfully.

Michelle S., Las Vegas, NV
 I’d purchase again!

After reading lava sand, holds heat longer and better than other fillers, which, actually makes sense. I thought this would be the right product, for neck pain. Having electricity close to your brain, from electric heating pads CAN, cause other problems.
It held the heat for a nice amount of time.

Wayne Longino

Good product!

Great quality, well-made. Seems to stay hotter longer than other brands, I really like it using it a lot.!!

Heidi Helm

Comfort That Outperforms The Rest

SUNNY BAY Others
USA Made, Natural, lava sand
Longer heat retention (up to 30min)
Washable cotton twill fabric
Even, balanced heat
Perfect size for back and shoulders
Effective Heat therapy
Washable, Reusable & durable
Chemical-free materials

1M+ People Have Found Relief That Speaks For Itself

Now you see why I'm obsessed!  You will too.
@Hollie

"Now you see why I'm obsessed! You will too."

The warmth is so relaxing.  Great for your tummy aches.
@Brittany

"The warmth is so relaxing. Great for your tummy aches."

@hollie

"I love SunnyBay products! You will love it too."

@Brittany

"My son and I use SunnyBay neck wraps daily. Check it out!"

@David

"You will feel tension melt away with the soothing warmth."

@Mary

"This is a perfect holiday gift! Your mom would love it."

@Ashely

"I am sure you love it as much as I do."

100% Money-Back Guarantee

We stand behind our products. If you’re not happy for any reason, you can get a full refund within 10 days — no questions asked, no hassle. 


Your comfort matters. Just reach out to our support team and we’ll make it right.

Frequently Asked Questions

For initial heating, microwave for 1–2 minutes, depending on your microwave wattage and the weight of your product:

• 2.5 lb heat wrap: 1 minute 40 seconds (maximum 2 minutes)

• 4 lb heat wrap: 2 minutes 30 seconds (maximum 3 minutes)

We use fresh seeds, and the natural moisture inside may cause the product to take longer to heat during first use.

Always check the temperature before use and adjust heating time as needed.

The wrap stays warm for approximately 20–30 minutes. To help retain the heat longer, we recommend covering the wrap with a blanket or towel during use.

After about 20–30 minutes, it’s normal for the heat wrap to feel cooler on the surface. However, the inside remains warmer than room temperature, which means it requires less time to warm up again and continues to provide comforting heat.

We ship most orders the same day from Seattle. Delivery usually takes 3 to 7 business days, depending on your location.

Heat therapy works well. Due to the nature of the natural seeds, they don't get very cold compared to the chemical pads. We improved the design by using thinner cotton in some models. It should help the heat and cold to permeate.

Many heat wraps feature anti-pill fleece on one side and high-quality T-shirt cotton on the other, while some smaller heat packs use thin cotton and fleece on each side. Common fillings include wheat or flax seeds, with or without lavender, as well as odorless hydrabeads.

At BioMed DB Design, we use only high-quality materials, carefully selected for comfort, safety, and long-lasting performance.

Yes. Our products are safe to travel with and can pass through standard airline security checks. In a car, it is not an issue.

No. Our products are made using only non-toxic materials and do not contain added harmful chemicals.

Materials may include:

  • Anti-pill fleece
  • High-quality T-shirt cotton
  • Wheat or flax seeds
  • Lavender (in select products)
  • Odorless hydrabeads

You may return the products to us within 30 days in original condition for a full refund.

Please email support@sunny-bay.com if you have any questions.

Customer Reviews

Based on 5 reviews
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A
Anonymous
works great

works great.

V
Venetta

I love that it stays hot for a long time and unlike heat packs made with rice or other such substances...this lava one doesnt get too hot and make the inside contents stink from burning.
I LOVE this heat pack!

a
ann tate
It's great

Fabulous

W
Wayne Longino
I'd purchase again!

After reading lava sand, holds heat longer and better than other fillers, which, actually makes sense. I thought this would be the right product, for neck pain. Having electricity close to your brain, from electric heating pads CAN, cause other problems.It held the heat for a nice amount of time.

D
Danyalle S.
Perfect sized sandbag

The 4lb lava sandbag is amazing. The lava sand comes from Utah which is pretty cool. The sandbag hears extremely well and holds its heat for over 20 minutes. I've used it on shoulder pain and I love the way this sandbag is wide enough to really cover the area needing it. My daughter loves to use it at night which leads to the dog hair on it like in the picture. Good thing is it washes easily and has no problems after that. Great value!