For free diving
1. Material：100% Food grade silicone
2. Softer, skin-friendly and more comfortable; Assist in diving
3. Color：3 colors availible， 500 pairs can be customized;
4.Size: XS (36-37)--Weight:1425g;
Size: S (38-39)--Weight:1446g;
Size: M(40-41)--Weight:1660g
L( 42-43)--Weight:2090g
