The Elasto-Gel cranial caps are primarily used for cold therapy to aid in relief with various headaches or to be used as a cool-down product after vigorous workouts to maintain over-heated body temperatures. The product is available in two sizes. CAP600 has the following dimensions: height is 29 1/2 cm for consideration of amount of hair user has; crown of head fits 37 cm or less; neck area fits 30cm or less. CAP602 has height of 31 cm which may be more appropriate for someone who has thick hair; crown fits 46 cm or less and neck area fits 35 cm or less. Product also sold by each unit.