I used these: https://smile.amazon.com/McDavid-Youth-Knee-Elbow-Black/dp/B01BD0DZKC/ref=mp_s_a_1_3?crid=3TVT84BAR3SGS&keywords=hex+knee+pads&qid=1662951829&sprefix=hex+knee+pads%2Caps%2C94&sr=8-3

They let me still have a full range of motion and they weren’t too tight but they still stayed up.

ETA: They were also pretty breathable.