This is a Tilos EXCEL low volume 1 lens mask for you to enjoy on your next dive. Features of this great mask include: Frameless design Low volume design for better visibility and easier clearing Soft nose for easy equalizing 1-window style for a large view Soft hypo-allergic silicone skirt and adjustable strap for a positive seal and long life Tempered glass lenses Available in all black or all clear Model #M150 This 1-Window Scuba & Snorkeling Mask is a GREAT durable mask. Great for scuba diving and snorkeling.