Side vents. Two-piece elastic waistband. Pre-laundered. All underwear is non-returnable.Washing Instructions Machine wash warm, inside out with like colours. Only non-chlorine bleach. Tumble dry low, medium/hot iron. Do not iron decoration - Side vents. Two-piece elastic waistband. Pre-laundered. All underwear is non-returnable.Washing Instructions Machine wash warm, inside out with like colours. Only non-chlorine bleach. Tumble dry low, medium/hot iron. Do not iron decoration