Premium durable shorts for those who don't stay still for long. They have a downward motion zipper which makes it easy to close and keeps phones, keys, ect secure until you want them to move. These are great for free running, Parkor, weightlifting, biking, running, frisbee, trail running, being casual, climbing, and so much more. These zipping shorts will zip like nobody's business. Zippy Ki-yay! Sizing: Our original PolyTech shorts are cut for muscles and made for activity so they tend to run a bit large when compared to normal sizing.