This wallet has excellent water resistance, making it perfect for playing in the water or snow. The opening involves first closing a zipper and then wrapping the fabric around and securing it in place with Velcro. This offers a high level of water resistance. Comes with loops you can use to attach a lanyard. Size S will fit coins, cards, and other small items. M is sized large enough to accommodate a smartphone, car keys, et cetera. *Though this product has excellent water resistance, it is not completely waterproof. It is not suitable for protecting against complete submersion.