? ''Vikingstrength Fitness Mask Pro'' increases your anaerobic threshold, it gives you better lung capacity and better stamina.
? The 8-level resistance system make this mask ideal for all users. Different combinations of valve placement give you the opportunity to choose from non to little-resistance to extreme resistance (this is extremely hard even for the pro endurance athletes)
? High quality materials makes this mask ultra light and comfortable to use, that will not slip during training
? Easy to disassemble, clean and wash

Technical Details

Product Details

Package Dimensions
Width : 6.81 inch
Height : 3.15 inch
Length : 8.03 inch

Shipping Weight: 0 ounce (View shipping rates and policies)

ASIN : B072NK418K

Product Description

Vikingstrength Fitness mask Pro