This is the ScubaPro Apnea Snorkel for Scuba, Free Diving, and Snorkeling Features: Made from soft and flexible non-toxic silicone. Traditional J-tube design is simple and reliable. The upper barrel can be removed for divers who prefer a shorter pipe. Can be folded to stow in an accessory pocket SCUBAPRO&';s APNEA or FREEDIVING SNORKEL easily attaches to your mask strap when being used. When not needed, it can be folded and stowed in an accessory pocket. When it&';s time to do some surface swimming, it pops right back into shape. Without question, this is a versatile and easy-to-use surface breather.