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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RESTCLOUD Back Stretcher for Back Pain Relief, Lower Back Stretcher Back Stretching Cushion, Lumbar Stretcher Device Helps with Spinal Stenosis Herniated Disc Sciatica Nerve

RESTCLOUD Back Stretcher for Back Pain Relief, Lower Back Stretcher Back Stretching Cushion, Lumbar Stretcher Device Helps with Spinal Stenosis Herniated Disc Sciatica Nerve

Product ID: 331941623

Details

Brand
RESTCLOUD
Color
Haze Blue
Fill Material
Memory Foam
Size
2 Piece Set
Special Feature
Back Stretcher

🌀4 adjustable intensity levels

🌊sea-shell ergonomic design

🛡️advanced memory foam support

MX$2521

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Sold byAmazon MexicoDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

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

ADVANCED MEMORY FOAM - Specialized polyurethane foam compresses for comfort while maintaining therapeutic shape.
TARGETED PAIN RELIEF - Effectively addresses spinal stenosis, herniated discs, sciatica, and muscular backaches with progressive spinal extension.
QUICK EASY DAILY USE - Just 5 minutes twice a day to realign your spine, improve posture, and reduce pain naturally.
ERGONOMIC SEA SHELL SHAPE - Contours perfectly to your lower and mid-back for full muscle group support and ultimate comfort.
CUSTOMIZABLE STRETCH INTENSITY - 4-level removable ball system lets you tailor your stretch from gentle to deep relief.

The RESTCLOUD Back Stretcher is a sea-shell shaped lumbar device crafted from advanced memory foam, offering 4 adjustable intensity levels to progressively stretch and realign your spine. Designed for quick daily use, it targets pain from spinal stenosis, herniated discs, and sciatica, promoting improved posture and lasting back health.

Specifications

ASIN	B095KGVJZN
Age Range Description	Adult,Senior
Best Sellers Rank	#188,332 in Health & Household ( See Top 100 in Health & Household ) #184 in Lumbar Supports #687 in Manual Back Massagers
Brand Name	RESTCLOUD
Color	Haze Blue
Customer Reviews	4.0 4.0 out of 5 stars (642)
Fabric Type	Polyurethane Foam
Fill Material	Memory Foam
Manufacturer	Restcloud
Manufacturer Part Number	Lower Back Stretcher Shell Shaped
Material Type	Polyurethane Foam
Model Name	Back Stretcher for Back Pain Relief
Model Number	Lower Back Stretcher Shell Shaped
Product Care Instructions	Hand Wash Only
Recommended Uses For Product	Sitting
Shape	Sea Shell
Size	2 Piece Set
Special Features	Back Stretcher for Pain Relief, Spine Stretcher
Specific Uses For Product	Helps with Spinal Stenosis Herniated Disc Sciatica Nerve muscular backache
Target Use Body Part	Whole Body
Unit Count	1 Count

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MX$2521

Duties & taxes included

In stock

Sold byAmazon MexicoDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to Mexico.

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