The Sea to Summit Camp Mat Self Inflating is a self-inflating sleeping mat with 1.5" of foam thickness with Delta Core-V coring to remove unnecessary weight and minimize packed size. A 75D polyester top and bottom fabric offer durability. R4 insulation rating for 3-season sleeping.Features: Smaller die-cut holes in body contact areas -- shoulder, hips, and feet -- keep you warm Larger die-cut holes in non-body contact areas reduce the mat's weight and bulk Constructed using Delta Core-V techniques to minimize weight and bulk, yet maximize warmth. Using pressure-mapping data to define the contact areas createsa map for the distinct core pattern. Patent-pending multi-functional valve. High flow rate for easy inflation; one-wa deflation mode prevents re-inflating while packing up and fine-tuningbleed valve for customized comfort Robust and durable 75D polyester with extrusion laminated TPU used on top and base Made with environmentally friendly polyurethane foam that is very lightweight yet still offers excellent memory and self-inflatingperformance Comes with a 30D stuff sack and easy to use repair kit Specs: Weight (REGULAR): 1 lbs 9 oz Material: 75D polyester Insulated Pad: Yes Insulation: Foam R-Value: 4 Pad Thickness 1.5" Pad Width (REGULAR): 20" Length (REGULAR): 72"