I just went to the REI website where they actually have dimensions...7"x14"x3". I find it to be a perfect size for its purpose. The 7x14 area fits right into your lumbar area. The 3" is the thickness when it's fully inflated, but you'll not doubt let some air out to suit your personal comfort level. I can't say enough good things about this pillow. I love mine. I actually left my first one of an airplane, never to be seen again, and immediately ordered a replacement, so as not to be without one.

What is the size of the pillow inflated?

18" by 9" by 2", including a 0.75" flat rim all around. You can get it a bit thicker than 2" by blowing air into it, or a bit (or a lot) thinner by not allowing it to fully inflate.

is this self inflating

yes, but after a while, when the valve was screwed closed and pillow rolled up, it kept semi-self-inflating. Not a positive. I went to the Cocoon line and love them (e.g. Cocoon Air-Core Ultralight Lumbar Support Pillow)

how quickly and how does it deflate?

Deflates quickly by using the valve in it.

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Description

🛫 Elevate your travel comfort—because your back deserves first-class treatment.

PACKABLE POWERHOUSE - Ultralight 3.6 oz and compresses to a compact 4 x 7 inches—fits seamlessly into your travel kit.
ONE HANDED ADJUSTMENT - Easily tweak firmness with a simple valve operation, perfect for busy professionals on the move.
SPINE SMART PRESSURE RELIEF - Die-cut foam reduces spinal pressure while providing firm lateral support for all-day comfort.
EFFORTLESS COMFORT ON THE GO - Self-inflating design lets you customize lumbar support instantly, no extra gear needed.
CRAFTED IN THE USA WITH DURABLE POLYESTER - Built to last with breathable, resilient materials that keep you supported wherever you work or wander.

The Therm-a-Rest Lumbar Travel Pillow is a lightweight, self-inflating lumbar support pillow featuring die-cut urethane foam that reduces spinal pressure while providing lateral stability. Designed for travel and office use, it weighs just 3.6 oz and packs down to a compact size, with an easy one-hand adjustable valve for personalized comfort. Made in the USA from durable polyester, it’s the perfect ergonomic companion for professionals seeking relief on the go.

Specifications

Brand	Therm-a-Rest
Special Feature	Adjustable, Inflatable, Lightweight, Portable
Color	Nautical Blue
Size	One Size
Fill Material	Urethane Foam
Shape	Rectangular
Age Range (Description)	Adult
Recommended Uses For Product	Travel, Supporting bad seats
Use for	Back
Material	Polyester
Item Firmness Description	Adjustable
Product Dimensions	16"L x 2.4"W x 7"H
Product Care Instructions	Hand Wash Only
Number of Pieces	1
Pattern	Solid
Item Weight	0.31 Pounds
Material Feature	Breathable, Durable, Resilient
Variety	Lumbar Pillow
Fabric Type	Polyester
Model Name	Therm-a-Rest lumbar travel pillow
Specific Uses For Product	Cars, Office Chairs, Travel
UPC	040818064382
Manufacturer	Therm-A-Rest
Product Dimensions	16"L x 7"W
Unit Count	1.0 Count
Global Trade Identification Number	00040818064382
Item Package Dimensions L x W x H	17.52 x 10.2 x 2.91 inches
Package Weight	0.16 Kilograms
Item Dimensions LxWxH	16 x 7 x 3 inches
Brand Name	Therm-a-Rest
Suggested Users	mens
Number of Items	1
Part Number	040818064382
Model Year	2014
Style	Modern
Fill Material Type	Urethane Foam

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