Sizing information: (Elbow circumference) Sm: 8-9.5 inches, Medium: 9.5-11 inches, Lg: 11-12 inches, XL: 12- 14 inch, 10% nylon / 65% polyester / 25% rubber. Machine wash warm. Tumble dry low :) It shrinks just enough to hold my elbow tight and also keep the elbow warm. I can still bend my arm beyond 90 degrees without restriction, but with a firm feeling of support. It's a bit thicker so I wouldn't run or do anything extremely intense unless you need loads of breathability. I use it for weightlifting and some extra support when using heavier weights without too much restriction. Here's what the packaging says: Primary protection designed for - Mild elbow pain - Mild sprains - Mild instability - Arthritis - Bursitis - Tendonitis - Softness. Tissue Support - Compression to reduce pain and promote healing - People allergic to neoprene.
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