Comfortable splint provides direct support for the thumb CMC joint while allowing full finger function. Wraparound supports are made of thin, 1/4" (3.2 mm) perforated neoprene with a terrycloth liner that helps keep skin cool and comfortable. Anti-microbial and latex-free. Specifically designed for osteoarthritis and medial subluxation of the thumb CMC joint. Provides gentle compression that helps relieve thumb discomfort associated with CMC joint arthritis and/or instability, tendinitis or repetitive motion. Contoured neoprene strap wraps around the thumb CMC joint and the first metacarpal for direct CMC joint support.