How long do I need to let this “rise” out of the packaging before I use it?

The moment you cut into the plastic, it should rise. The package reminds me of the vacuum-seal products on the market.

Is it to soft that it won’t support your tailbone?

It has good support, however if you are tall it raises you up a bit. I use it on trips longer than 2 hours and find it helps.

I'm a large man at 300 lbs? Will it work or will I just pancake it?

It's a little more than straight mem foam so it's not too bad, I am 300+ lbs as well and I use it in the car , seems to work well....

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SAIREIDER Seat Cushion and Lumbar Support Pillow for Office Chair, Memory Foam Car Seat Cushions Back Support Pillows, Help Relieve Pain of Back, Lumbar, Tailbone and Sciatic Nerve（Black）

Product ID: 506373937

Details

Brand
SAIREIDER
Color
Seat
Fill Material
Memory Foam
Size
Universal
Special Feature
Adjustable

🔒Non-slip & adjustable straps

🧠100% high-density memory foam

🛋️13.8" x 12" ergonomic size

¥20203

Duties & taxes included

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Sold byAmazon JapanDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🖤 Sit Smart, Work Strong — Elevate Your Comfort Game!

STAY PUT STABILITY - Non-slip bottom and dual adjustable straps keep cushions perfectly positioned, no matter how active your workday gets.
VERSATILE COMFORT ANYWHERE - Ideal for office chairs, cars, gaming setups, and more—your all-in-one solution for back and tailbone pain relief.
SPINE HUGGING LUMBAR SUPPORT - Anatomically contoured pillow supports upper, middle, and lower back for posture perfection and fatigue reduction.
DURABLE MEMORY FOAM RESILIENCE - SGS-certified high-density foam quickly regains shape, ensuring lasting comfort without flattening.
TAILBONE RELIEF ELEVATED COMFORT - U-shaped cutout design suspends your coccyx, eliminating pressure and soothing sciatica pain during long sits.

The SAIREIDER Seat Cushion and Lumbar Support Pillow set combines premium 100% high-density memory foam with ergonomic U-shaped and anatomically contoured designs to relieve back, tailbone, and sciatic nerve pain. Featuring non-slip bottoms and adjustable straps, this versatile duo fits office chairs, car seats, and more, promoting healthy posture and all-day comfort for professionals who demand both style and support.

Specifications

ASIN	B0BLHWZ3VJ
Age Range Description	Adult
Best Sellers Rank	#19,110 in Home & Kitchen ( See Top 100 in Home & Kitchen ) #17 in Lumbar Pillows
Brand Name	SAIREIDER
Coin Variety 1	Lumbar Support,Memory Foam,Seat Cushion
Color	Seat Cushion&lumbar Pillow-black
Customer Reviews	4.4 4.4 out of 5 stars (1,997)
Fabric Type	100% Memory Foam
Fill Material	Memory Foam
Item Dimensions L x W	13.8"L x 12"W
Item Firmness Description	Soft
Item Type Name	Seat Cushion and Lumbar Pillow
Manufacturer	SAIREIDER
Manufacturer Part Number	seat cushion lumbar support-01b
Material Type	Memory Foam
Model Name	Seat Cushion and Back Support Pillow
Model Number	Seat Cushion &Back Support-LS01b
Number of Pieces	1
Pattern	Solid
Product Care Instructions	Machine Wash
Recommended Uses For Product	Car
Shape	Rectangular
Size	Universal dimensions
Special Features	Adjustable
Target Use Body Part	Back, Legs
UPC	342976985661
Unit Count	1 Count

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¥20203

Duties & taxes included

In stock

Sold byAmazon JapanDelivered 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 Japan.

Secure transaction

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TrustScore 4.5 | 7,300+ reviews

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