Perfect For Gram Counters, The Aeros Inflatable Backpacking Pillow Has A Soft 20d Stretch Polyester Exterior And A Silent, Contoured Tpu Air Bladder For Support And Comfort. Inflation, Adjustment, And Deflation Take Seconds, Thanks To The Patent-pending Multi-function Mini Valve. Updated For 2019 To Add Compatibility With The Unique Sea To Summit Unique Pillow Lock System.