Elastic stitching in the sports area: The knees, back waist and crotch are made of elastic material stitching, which greatly reduces the pulling force on the legs during extreme sports. All the size is provide for your reference, 1 3 cm error should be accept, 1 cm is equal to 0.39 inch. As different computers display colors differently, the color of the actual item may vary slightly from the above images, thanks for your understanding.