Heat Holders 2.3 tog joint warmers are made for legs, knees and elbows, in two sizes and a stretch knit that will accommodate most joint sizes. With our trademark intensively brushed inner, our joint warmers are designed to hold more heat in for longer as well as offering a super-soft feeling against your skin.Composition : 91% Acrylic, 5% Nylon, 3% Polyester, 1% Elastane