R-Value 6.5
From Amazon
Sea to Summit - Comfort Deluxe Self Inflating Sleeping Mat Double - Premium Comfort - Delta Core Technology - Pillow Lock System - 4 Season - For Winter Camping - 201 x 132cm - Byron Blue - 4225g
The product is available from £205.13 at international stores.
GearFreak.uk
Sea to Summit - Comfort Deluxe SI Self-Inflating Sleeping Pad Double
OnBuy
Sea to Summit Comfort Deluxe SI Mat