20% nylon/50% polyester fiber/30% polyurethane.EffectiveforPainReliefSylong elbow brace is best for all types of Elbow Inflammation, Injuries, Elbow Fractures and discomfort,such as tennis elbow,cubital tunnel syndrome.It provides comfortable support by gently fixing the elbow,keeping the elbow straight at night sleeping.Stabilizing SupportDesigned with three plastic support strips,These three strips are evenly distributed around the arm,which can effectively fix the arm.To prevent the arm movement and keep the arm straight.Comfortable and LightweightThe splint has soft foam as Light as a Feather,padding lined with breathable cotton and covered with flannel-like fabric that allows your skin to breatheprovide Comfortable Compression for Your Elbow.Anti-drop Shoulder StrapFeatured shoulder strap to prevent the elbow splint from sliding down the elbow during the night.Hook & loop closure can be easily adjusted with one hand for desired compression and support, fits left or right arm.2 SizesWe have two sizes to accommodate all size arms. S/M for smaller arms and L/XL for larger arms. To determine the correct size needed, measure the circumference of the middle of the bicep. The S/M size fits 10-14 inch biceps. The L/XL fits 12-16 inch biceps.