I use these

ToughBuilt - Gelfit Thigh Support Stabilization Knee Pads - Heavy Duty, Comfortable and Adjustable - (TB-KP-G3) https://www.amazon.com/dp/B0140V9LWC/ref=cm_sw_r_cp_api_glt_fabc_QXKK81MS4E7Y96SM7ZF1