SPECS Regular Weight: 5.6 oz. Width: 15.5 in. Length: 11 in. Thickness: 4 in. Fill Materials: eraLoft Synthetic Insulation Materials: Polyester cover, Urethane insert Large Weight: 7.7 oz. Width: 18 in. Length: 12.5 in. Thickness: 4 in. Fill Materials: eraLoft Synthetic Insulation Materials: Polyester cover, Urethane insert DESIGN & DESIGN The MSR Air Head™ Pillow is designed with a thoughtful shape that nestles into the hood of your sleeping bag Compact for easy packing and travel with a nonslip, removable cover 4" thick, baffled air chamber for stability, loft, and head support Synthetic-fill top with brushed exterior allows for next-to-skin comfort