PIC Bugables Mosquito Repellent Silicone Band. It is deet free and lasts for 9 days. It comes with 3 inserts and is adjustable. It is effective for 72 hours x 3 = 216 hours. It is waterproof and has no skin contact. The formulation is entomologist tested. Contains one wristband and 3 cartridges. One size fits all. Each refill cartridge lasts up to 72 hours The cartridges are waterproof making them ideal for outdoor use in all weather conditions. Each wristband comes in a resealable foil bag to store when not in use, extending its freshness. Each case includes 12 wristbands in assorted colors.