These are a great pair of summer riding pants. Could probably even use late fall and early spring. I ordered a large because other reviewers on other sites were saying the pants run small-I wish I would have ordered a medium. A large is large in the waist and a little to large throughout the legs. I am 5'9" 180 with an athletic build for reference. I dont plant on using an under pant either-size might work if I was. Over all though, great summer riding pant with excellent ventilation, fit and construction. These do go over boots as well-was hoping I could tuck them into my boots but with the zipper on the bottom it doesnt feel comfortable. Would buy again especially for the price.