ALWAYS CHECK THE SIZE CHART (IN IMAGE SECTION ABOVE). SIZES PROVIDED ARE UK SIZES, BE SURE TO MEASURE AND CHECK THE SIZE CHART BEFORE ORDERING. The Boys TYR Mosaic All Over Racer brief is a great choice for young swimmers that require a new swimsuit for training or leisure swimming. The Mosaic All Over Racer brief has been constructed with TYR's Durafast One® fabrication, which is made with 100% polyester construction, making it nearly 20 times stronger than traditional swimwear.  This material provides a secure fit and doesn't fade over time, keeping it looking newer for longer. This provides unrestricted mobility and a comfortable fit, making this brief ideal for athletes who want a combination of minimal coverage and comfortable support during every swim. The TYR Mosaic All Over Racer brief is fully lined and features both a compressive fit and an adjustable drawcord.  The Durafast One® fabric includes 4-way stretch technology, which provides flexibility and stretchability whilst still having a moderate compression.  The chlorine proof material will endure an impressive 300+ hours of performance. Features:     Adjustable drawcord waist    Bold print    Fitted brief style    Fully lined    4-way stretch technology    UPF 50+ sun protection.    Chlorine proof    Impressive 300+ hours of performance.    TYR Durafast One®: 100% Polyester.