3D Inner Bracket will help a lot on improving it by creating more breathing space because the silicone internal support frame can hold up the fabric off the mouth. You will feel cool and easy to breathe.
Size & Spec:
Material: Food Grade Silicone
Color: Translucent
Size: 3.9*3.5*1.6in/10*9*4cm
Weight: 0.2oz/5g
Packing List: 6Pcs