D102 (Mask) Lenses are made of tempered safety glass with anti-fog coating PVC face skirt provides an ultimate comfort and a secure seal Easy-Adjust buckles, One size fits most DX512 (Snorkel) Semi-dry top design prevents most water from entering the snorkel High quality mouthpieces are made of durable, soft PVC material for great comfort One-way purge valve makes it easy for a diver to clear water that enters the tube Snorkel placement - Place snorkel on left side of face attaching snorkel keeper clip to mask strap