-RH means you wear your glove on your right hand. It should be included at the end of the model number on your order.
Because it also means that you throw with your left hand, be sure Throws With Left Hand is shown in the cart.
This medium weight, pull-up pant is a great value pant. It features a fake fly front and belt loops along with a gathered elastic waistband and drawstring for comfort. These pants also come equipped with one set-in back pocket and double knees for durability.