Product Specifications Unexpanded size: Cast cover: 11.5'' x 8.5'', Up hole diameter: 1.8'', Down hole diameter: 1.4'' Suitable arm size range(Expanded): Large hole : Circumference from 9.5" - 15.7", diameter from 3" - 5"; Small hole: Circumference from 6.2" - 12.5", diameter from 2" - 4" Recommendations * About Size: As long as your upper arm is within 3'' to 5'' in diameter, it will fits perfectly * About Materials: Compared to PVC used in most other PICC line shower covers, we choose a better material TPU, TPU has better wear resistance, low-temperature resistance, oil resistance, chemical resistance, and resilience than PVC, and is recognized as an ECO-friendly material, widely used in medical supplies * About Coverage: It can cover half of the arm, generally used in the position of the elbow, and can be adjusted freely * About Usage: Do not use for more than 30 minutes at a time to prevent compresses the blood vessels in the arm * About Cleaning: In order to keep it clean, just wipe the outside and hang it to dry after use * About Swiming: The film is designed to protect the PICC or cast so it's very loose, which means it has a lot of air inside, so it's only suitable for shower and bath, not for swimming * About Smell: The TPU film is ordorless. but the entrance may have some smell at the first time, wich is a normal phenomenon of neoprene like diving suits, the product is non-toxic, but if you concern, We recommend hang it for a day for ventilation, the smell will disappear