The RJ Classics Sienna Jr 37.5 Girls Quarter Zip gives ever rider that classic, yet sporty look that will never go out of style. The patented thermo-regulation technology has proven to help your body manage its core temperature and therefore, increase stamina. It keeps you comfortable by helping your body to maintain an optimum core temperature of 37.5 Celsius (99.5 Fahrenheit) which is ideal for peak athletic performance. The particles are naturally derived and work for the life of the product (it will never wash out!). Some colorways feature a unique patterned mesh, while others feature a tonal mesh.
Product Details:
- 37.5 thermo-regulation technology
- Main body fabric has UPF 50 sun protection
- Mesh underarm panels
- 44% Polyester/44% 37.5 Polyester/12% Spandex
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