Chlorine resistance:Swim for as long as you want thanks to its highly chlorine-resistant material. AQUARESIST technology: Products holding the AQUARESIST label are guaranteed to be resistant to chlorine. They will maintain their elasticity and are UV resistant. For these reasons they are recommended for regular or intensive pool use. Swimsuit material: Our engineers have developed a polyester-based fabric and replaced the elastane fibre with elastolefin fibre, which is stretchy enough to provide user comfort but, more importantly, is unaffected by chlorine. This thread also has the advantage of quick drying. Another plus: Even the brightest of colours will retain their colour fastness. Lining: Swimming briefs with lining in front.