Cooling Arm Sleeves UV Protection for Hiking, Golf, Cycling, Fishing, Driving Measurement: 14.5 L x 4.25 W at bicep x 3 W at wrist. Size: Junior and Adult. The measurement are almost the same but Junior size is with elastic at bicep to make it more fit. The fabric stretch is also less than adult size. Junior size also fits on Women in size S. 92% Polyester, 8% spandex. Care Instruction: Hand wash separately. No Bleach. Cool Iron. No Dry Clean. Dry in shade. UV protection category Excellent tested by SGS.