SAPIANS AW Sublimation Neck GaiterNeck gaiters come in 2 styles; 1 and 2 layered, whilst 1 layer Neck Gaiters are lightweight and more flexible, 2 layer style is thicker and provide more warmth. Both styles have a filter pocket and come with a 5 layer PM2. 5 Activated Carbon Filter *Not meant to provide medical protection* You can also remove the carbon filter and use it as a standard neck gaiter. The neck gaiters tubular shape gives them a versatility that allows them to be moved up