99extra Underwear, Men's Sexy Blinking Cool Jockstrap 95% Ice Silk / 5% Spandex Imported Ice Silk is a term given to silk that is derived from milk. the fabric with a rich, velvety texture and feels very luxurious on the skin Very important: Acidic or alkaline laundry detergent will destroy "Ice Silk fiber", it only be used neutral detergent. Doctor advised, a underwear don't use more than 6 months, it will become very dirty although you repeated wash it International EMS delivery, U.S. domestic 7 to 15 days reached, other countrys 10 to 25 days reached.