Thin but warm

Covered with a special textile material which is waterproof

Stay-Put Design

YKK® zipper

RJ Classics Sienna 37.5 Women's Training Shirt - SALE Bridle Thin but warmOn Closeout SALE! The womens RJ Classics Sienna 37. 5 Schooling Shirt with 37. 5 technology gives ever rider that classic, yet sporty look that will never go out of style. 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