The Exped Air Pillow uses next to the skin friendly tricot polyester & is anatomically shaped to accommodate side or back sleepers. Basically its a wedge shape; thicker on one side for those who sleep on their side, & thinner on the other side for back sleepers. The middle of the pillow is shaped with a depression to keep your head in place during the night. You can just about squeeze this X-Large size into your sleeping bag hood or use the two handy tie loops to thread up a lace or some paracord to attach the pillow directly to your Exped mat. Featuring flat valve technology for fast inflation & deflation. Comes complete with stuffsac & repair kit. Adjustable for side or back sleepers Anatomically shaped to hold your head in place Flat valve technology for easy inflation & deflation Attachment points repair kit & stuffsac included