This is the Sharkskin Women&';s Performance Wear Long Sleeve Shirt Rashguard Features: Chillproof material to keep your torso and rear kidney area protected Breathable compression fabric in the shoulders and arms to aid in endurance and muscle recovery Compression fabric is SPF50+, so provides protection for your arms and shoulders from the sun Sharkskin&';s Performance range has been created with the help of competition athletes. The designs use Chillproof material for full protection from the elements, flexible compression material to allow for maximum manoeuvrability during intense sport and neoprene for stretch and comfort. The different designs use heavy-duty zippers to control heat retention and mesh panels for ventilation to allow for maximum performance as weather conditions change or as your heart rate climbs.