CastCoverz! Armz! Cover your arm cast with a subtle solid or colorful design from CastCoverz!, America's #1 trusted source. Our washable arm cast covers protect your clothes, furniture, and skin from snags and scratches, and keeps your cast clean. SIZING INFORMATION Dimensions refer to the cast measurements, not body dimensions. Measured length includes thumbholes (all stock arm CastCoverz! have thumbholes). Dimensions expressed as approximate Length by Circumference (bicep/forearm). Small Typically for children 6 years of age or younger or very small-framed adults with a thin cast/brace. Please call us when measurements fall outside of the dimensions below. 7" - 8" length x 7" circumference at widest part of cast Medium Typically for ages 7 through adult. Please call us when measurements fall outside of dimensions below. 11" length x 9" circumference at widest part of cast Large For large framed adults and casts. 13" length x 13" circumference at widest part of cast