FLA SAFE-T-SPORT Neoprene Knee Sleeve w/ OPEN Patella USE: Arthitis, Meniscal Tears, Joint Effusion, Patellar Instability, Knee Contusions, Quad Weakness, Knee Sprains/Strains. These knee sleeves not only help to limit swelling, but also protect the injured knee. The neoprene generates heat, which provides increased warmth to the knee, thereby increasing circulation and decreasing pain. The thickness of neoprene also helps restrict excess motion and provides added support. FEATURES: Four way stretch for proper fit and comfort Sports neoprene for therapeutic warmth Easy slip-on style Open patella for additional stabilization Open Patella Closed Patella Sizes Fits 37-373 37-374 X-Small 12 - 13" 37-373 37-374 Small 14 - 15" 37-373 37-374 Medium 16 - 17" 37-373 37-374 Large 18 - 19" 37-373 37-374 X-Large 20 - 21" 37-373 37-374 XX-Large 22 - 23" 37-373 37-374 3X-Large 24 - 25" Measure 4" above center of knee. Fits right or left. Catalog Numbers: Navy Extra Small (37-373XSNVY), Small (37-373SMNVY), Medium (37-373MDNVY), Large (37-373LGNVY), Extra Large (37-3731LGNVY), 2XL (37-3732LGNVY), 3XL (37-3733LGNVY) Black Extra Small (37-373XSBLK), Small (37-373SMBLK), Medium (37-373MDBLK), Large (37-373LGBLK), Extra Large (37-3731LGBLK), 2XL (37-3732LGBLK), 3XL (37-3733LGBLK)