I use Aplinestars Paragaon knee and eblow protectors. Both are low profile and light weight, meant for mountain biking. I've had one fall with them and hit my elbow and it protected well with 0 injuries or pain.
https://www.amazon.com/gp/product/B01AXZ3H5G/ref=od_aui_detailpages00?ie=UTF8&psc=1