Review (1/5): slips down, pulls mask down
100% does NOT hold mask in place. While it is bendable, it does not conform around your head. As such, if you are using inner hooks, the outside portion sticks out away from your head. It is also very slippery and slips down to the base of the skull on all hook combinations, causing the mask to be loose at best and pull down from the nose at worst. If one side of the plastic had a non-slip coating, this might help. It arroyo cost more but be worth the price. This ONLY helped with a friend who had a pony tail that the strap went above and kept from slipping.