The RJ Classics Sienna Jr. training shirt with 37.5® technology is the perfect schooling style for even your youngest riders. The patented thermoregulation 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!). This girls shirt colorways feature a unique patterned mesh.
| Color: Classic Navy Sorbet/Hearts |
| Youth Size: Medium & X-Large |
- 37.5® thermoregulation technology
- Main body fabric has UPF 50 sun protection
- Mesh underarm panels
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