The knee yellow part is kevlar meterial, it can protect the knee well when falling, we have size chat below for pant, and if you not sure you can send me your weight and height so we can suggest size foryou. Or, you can choose to get a replacement. Our goal is to ensure a happy shopping experience with us. This item is in the category "Clothes, Shoes & Accessories\Men\Men's Clothing\Trousers". The seller is "2018world*top1" and is located in this country: CN.This item can be shipped worldwide.