Does this Smoosh flat under the weight of a person?

It doesn't "smoosh" flat and it does provide a mild arch and the added insert increases the arch - and it's more comfortable than the plastic versions, but it doesn't arch the back as much as the plastic versions do.

Can you use all night to sleep on? Or use in your office chair all day?

I dont think you would want to sleep on this. One, it is to be used a short time to stretch the back and is not particularly comfortable while doing that and two, you arent going to stay in one position all night without moving. You could use it in your office chair but unless you are sitting hard against it, it will want to move. Both the uses you have asked about are not what the product is for and there are other products designed for chairs and sleeping that would be better. This is for short duration stretching the back muscles.

Does this flatten like a pancake when the weight of a person is on it?

I suppose it depends on the weight put on it. It didn't for me. It's more comfortable than those hard plastic ones. Though there is some give to it, it doesn't just flatten out.

Will this work with a 300lb person

It is very firm and I think it would work.

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Back Stretcher for Back Pain Relief, Back Massager Stretcher Equipment Lower Back Stretching Cushion, Chronic Lumbar Support Pillow Lumbar Stretcher Helps with Spinal Stenosis Herniated Disc Sciatica Nerve

Back Stretcher for Back Pain Relief, Back Massager Stretcher Equipment Lower Back Stretching Cushion, Chronic Lumbar Support Pillow Lumbar Stretcher Helps with Spinal Stenosis Herniated Disc Sciatica Nerve

Product ID: 411205375

Details

Age Range (Description)
Adult
Brand
RESTCLOUD
Fabric Type
Polyurethane
Manufacturer
Restcloud
Material
Plastic
Product Care Instructions
Hand Wash Only

🌀4 adjustable intensity levels

🧠Advanced memory foam comfort

🛋️Ergonomic sea-shell design

€ 177.69

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Sold byAmazon SlovakiaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🛋️ Stretch smarter, feel stronger — your back’s new best friend!

TRUSTED BY EXPERTS - Recommended by chiropractors and physical therapists for spinal stenosis, herniated discs, and sciatica.
THERAPEUTIC MEMORY FOAM - Specialized polyurethane foam adapts to your spine, maintaining shape while easing pressure.
ERGONOMIC SEA SHELL SHAPE - Contours perfectly to your lower and mid-back for full muscle support and ultimate comfort.
QUICK EASY DAILY RELIEF - Just 5 minutes twice a day to improve posture, flexibility, and reduce chronic pain naturally.
CUSTOMIZABLE STRETCH INTENSITY - 4-level removable ball system lets you tailor your back stretch from gentle to deep relief.

The RESTCLOUD Lower Back Stretcher features a unique sea-shell design and advanced memory foam to provide customizable, progressive spinal extension. With 4 intensity levels via a removable ball, it targets upper, mid, and lower back pain, promoting natural relief from conditions like herniated discs and sciatica. Easy to use in just minutes daily, it’s a chiropractor-recommended solution for improving posture, flexibility, and overall back health.

Specifications

ASIN	B095KGVJZN
Age Range Description	Adult
Best Sellers Rank	#591,494 in Health & Personal Care ( See Top 100 in Health & Personal Care ) #3,572 in Back Braces
Brand	RESTCLOUD
Customer Reviews	4.0 4.0 out of 5 stars (570)
Enclosure Material	Plastic
Fabric Type	Polyurethane Foam
Manufacturer	Restcloud
Manufacturer Part Number	Lower Back Stretcher Shell Shaped
Model number	Lower Back Stretcher Shell Shaped
Product Care Instructions	Hand Wash Only
Special Features	Back Stretcher for Back Pain Relief, Back Stretching Cushion, Chronic Lumbar Support Pillow, Spinal Stenosis Herniated Disc Sciatica Nerve Pain Relief
Specific Uses For Product	Herniated Disc,Lumbar Support,Muscle,Nerve,Pain Relief,Sciatica,Spinal Stenosis
Target Use Body Part	Back

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