I can but it's a hassle to do a returns etc.
Simply quicker to sell on privately.
I normally wear large but chose XL knee pads on the basis that i didnt want the knee pads to be so constrictive. In that context, the XL ones accomodates that very well so long as you do up the velcro straps.
however, my only gripe is that there is too much material that sticks out at both sides of the knee joint which is why i described it as "too loose fitting". In hindsight, it probably wasnt the best description of my issue with the pads lol.