Provides support for the thumb CMC joint while allowing full hand function. Made of 1/16" perforated neoprene, with a terry cloth liner that helps to keep the skin cool and comfortable. Ideal for use with CMC joint arthritis and/or instability, tendonitis, tenosynovitis or RSI’s. Reinforced stitching allows the splint to be trimmed below the thumb MP joint if needed. Latex free.