Super compact accordion design helps this pad slip anywhere in your pack. Molded egg carton shape maximizes comfort and shaves weight. As an added bonus, the pad lays flat when there is no weight on it.
Therm-a-Rest's Website

Product Details
Weight:	11oz/15oz (Short/Regular)
Thickness:	.75"
Length:	47"/72" (Short/Regular)
width:	20"

Therm-a-Rest Z-Lite

Item# caszrest

$29.95

Size: ShortRegular (+$5)

Availability: Usually ships in 2-3 business days