Hook and loop closure design fits most knee sizesopening relieves pressure on the patellaprovides compression for weak or overstressed knees retains heat to warm muscles and increase blood circulation indicationweak knee mild starinsprain arthritissizeone size fits all 344 42cm in blue colormeasurementmeasure the circumference of the knee at the patella with knee fully extendedfiber content75 closed cell neoprene foam 25 stretch nylonwashing instructionhand wash in cold water