Shop the Klein Oak High School Apparel Store for a wide selection of men’s t-shirts at Prep Sportswear. With short sleeve, long sleeve and tank style tees available, there are hundreds of different ways for you to customize Klein Oak High School t-shirts for men. Whether you are a student, parent, alumni or faculty member, your customized Panthers clothing shows your pride and support for Klein Oak High School. Looking for something a little warmer than a t-shirt? Check out our collection of customizable Klein Oak High School Men’s Sweatshirts , Outerwear and Hats .