New for 2012: Forty years ago, we patented the first self-inflating mattress and introduced the world to a new level of backcountry comfort. We're celebrating our anniversary with a limited edition mattress featuring our original logo and colors. The 40th Anniversary Edition mattress may look like a throwback to our first Therm-a-Rest® mattress, but it features cutting-edge technology that offers excellent comfort, packability and 4-season warmth. The foam in this mattress is the lightest, most compressible foam we've ever used, allowing greater comfort without additional weight or bulk. Stuff sack and repair kit included.
| S | R | L | |
| Color | 1972 Yellow | 1972 Yellow | 1972 Yellow |
| R-Value | 4.0 | 4.0 | 4.0 |
| Weight | 1 lbs 1 oz / 480 g | 1 lbs 8 oz / 680 g | 2 lbs / 900 g |
| Width | 20 in / 51 cm | 20 in / 51 cm | 25 in / 63 cm |
| Length | 47 in / 119 cm | 72 in / 183 cm | 77 in / 196 cm |
| Thickness | 2 in / 5.0 cm | 2 in / 5 cm | 2 in / 5 cm |
| Packed dimension | 11 x 4.0 in / 28 x 10 cm | 11 in / 4.8 cm | 13 x 5.7 in / 33 x 14 cm |
| Volume | 3936 cu. in | 5923 cu. in | 6237 cu. in |
| Top fabric type | 75d Hex Rip Poly | 75d Hex Rip Poly | 75d Hex Rip Poly |
| Bottom fabric type | 70 d Nylon Soft Grip | 70d Nylon Soft Grip | 70d Nylon Soft Grip |
| Foam type | Diagonal Punched | Diagonal Punched | Diagonal Punched |
| Fill material | Urethane Foam | Urethane Foam | Urethane Foam |
| Country of Origin | Made in Seattle, USA | Made in Seattle, USA | Made in Seattle, USA |