I've used these for probably 15 + years on my old mountain bike, on rear only
https://www.mec.ca/en/product/4000-4...flector-Shield
I use two, one zip tied to rear rack, and another continuing down the seat tube, again zip tied
Is light, simple, super tough and flexible, keeps flung up stuff off my back, and seat tube one keeps crud off fd and chain a reasonable amount.
An easy and effective way to get some fender protection advantages without real fenders
Ain't pretty thoughIn the shot with orange panniers, you can see back one extending behind rack. Could have less sticking out, just stops having a muddy wet line up your back, and other one does help the fd area