Sharkskins: Great underneath wetsuits and drysuits, or in swimming pool and tropical waters Protects against stings, abrasions, and sunburn 16 oz. 300 denier polypropylene from Amoco fibres Increased fabric weight gains higher insulation, greater wind resistance, and more durability than any other fabric Blended with 70 denier chlorine-resistant lycra 100% protection from U/V rays Spinepad made of open cell foam YKK Delrin zippers Double-brushed inside for greater comfort and softness, sewn with super-soft polyester thread. Flatlock stitching instead of overlock Velcro-resistant Men's sizing S-XXL; colors Black/black, Blue/black, Purple/black Women's sizing XS-XL; colors same as above plus Pink/black