Order by fin size. S/M fits shoe size 4.5 - 8.5 L/XL fits shoe size 9-13 Mask 3-window design for wide vision Purge valve in mask to easily remove water Tempered glass: meets all ANSI standards Silicone skirt and strap: soft and comfortable fit Quick adjust strap: pull strap to tighten and push button to loosen Pivot buckle: adjust strap to angle for better fit Snorkel Dry top: keeps water out of snorkel when underwater Purge valve: easily clear any water from snorkel Full silicone mouthpiece: reduces jaw fatigue Flex tube: allows snorkel tube to adjust for better fit Quick release: easily attach and remove dive mask Fins Flex system: allows the blade to flex for more power Flow channels: easier to kick underwater reducing fatigue Flexible foot pocket: comfortably adjust to feet Quick release: easy on and off Drain hole: allows water to flow through foot pocket Non-slip tread: bottom pattern helps prevent slipping