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 腰サポート枕オフィスチェアクッション低反発素材カーシートクッションバックサポート枕尾骨と坐骨神経への圧力を軽減背中と腰の痛みを和らげます (グレー)

SAIREIDER 腰サポート枕オフィスチェアクッション低反発素材カーシートクッションバックサポート枕尾骨と坐骨神経への圧力を軽減背中と腰の痛みを和らげます (グレー)

Product ID: 749281965

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Details

Brand
SAIREIDER
Special Feature
グレー
Color
グレー
Size
Universal
Fill Material
メモリーフォーム

🔒Non-slip & adjustable straps

🧠High-density memory foam

🪑Ergonomic U-cut design

Description

🪑 Elevate your sit game—comfort that means business.

PREMIUM MEMORY FOAM - SGS-certified, high-density foam that bounces back instantly—no flattening, no compromise.
SECURE STABLE FIT - Non-slip base plus dual adjustable straps keep your cushion locked in place, wherever you sit.
PRESSURE RELIEF U CUT - Suspends your tailbone to eliminate numbness and pain during long sits.
ERGONOMIC SPINE SUPPORT - Contours perfectly to your back’s natural curve for all-day posture alignment.
VERSATILE COMFORT ANYWHERE - From office to car, gaming to flights—your ultimate companion for pain-free sitting.

The SAIREIDER 腰サポート枕 & シートクッション set features an ergonomic U-shaped cutout to relieve tailbone pressure, high-density SGS-certified memory foam for durable comfort, and a non-slip base with adjustable straps for a secure fit. Designed to support the entire back and promote healthy posture, it’s perfect for professionals, drivers, and anyone facing long hours seated. Machine-washable cover and vacuum-sealed packaging ensure hygiene and freshness on arrival.

Specifications

Manufacturer	SAIREIDER
Model Number	Seat Cushion &Back Support-LS01g
Package Dimensions	33.2 x 22.6 x 10.2 cm
Material	メモリフォーム
Color	グレー
Volume	458.16 Cubic Inches
Size	Universal dimensions
Special Features	グレー
Package Weight	1.45 Kilograms
Batteries Required	No
Batteries Included	No
Material Care Instructions	洗濯機洗い
Brand Name	SAIREIDER

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