Oceanic Lavacore Lavaskin Women's Scuba Diving Short Sleeve Shirt Polyester outer layer/fleece inner. Breathable and Waterproof by using the same DWR coating as on the Polytherm fabric. 4-way stretch for easy, unrestricted mobility and comfort ? even under dry wear. The Performance Cut and flat seam construction fits comfortably without irritation. Abrasion Protection