Extended and cushioned design floats the heel over an air cavity for ZERO pressure and provides air circulation to aid the healing of existing ulcers.NEW PERFORMANCE WIPE CLEAN COVER! Never lose the gel-pack again. No need to launder! Wipes clean for convenient patient infection control. ANTIMICROBIAL treated, pressure reducing fabric promotes healing via active evaporation of moisture and cooling at patient pressure points.SIZING To choose the correct size, measure the circumference of the lower part of the calf muscle. Petite Adult / Pediatric fits a calf circumference of up to 15”. Average Adult fits a calf circumference of up to 20”. Large Adult / Bariatric fits a calf circumference of up to 25”.A removable GEL-PACK may be utilized to further lower pressure beneath the ankle and keeps feet cool.Features an adaptable strap that permits this device to be secured at two alternate positions. Lower position controls dorsiflexion. Padded hook and loop closure allow easy application and removal. Additionally, foam cushioned sides protect lateral and medial malleoli - bony prominence on both sides of the ankle.