Mother's Day gifts for horse loving moms. The Horse Holster is a great pick for moms who love to ride! If she's like me, she has often run into the problem of where to keep her cell phone and other important things when she's on her horse. This problem is easily solved with the Horse Holster! It's got plenty of space for mom's cell phone, keys, ID, and other things that she needs to keep with her on her rides.