One has detachable ankle guards and the other does not.

They have a sizing chart on the fuse website and on sourcebmx.com

I am still using them, the only issue I have had is they don't fit under my pants and they are a bit too tight over my pants. The only damage they have sustained after several hard falls is an area of the neoprene ripped when I fell last time I was riding which cannot be repaired so I'll have to replace them however they saved my leg from being cut open from my peg during the fall when my bike fell into my leg. I'll most likely be buying the Omega version this time around.

@@TheSk8deshtruction thanks. I was looking into the omega but cannot find them anywhere for UK.

@@JannyUK the echo version are still very good pads you won't be disappointed with them.

Personally I'd recommend going with what fits your thighs so you don't have extra bulk in that area. Having your pants too tight in the thigh and groin area is a recipe for ripped pants. The calve area has pretty good stretch.

@@sk8deshtruction Thank you for your feedback. I was somewhat settled on L but now you have me thinking M. I do have a friend who owns the Echo 125’s in medium who’s offered to let me try them on. Might take him up on that. Different brands, but for what it’s worth I wear medium knee braces for motocross and medium shin guards for snowmobiling.

I have the exact same problem as you. My thighs are size medium, my calfs are XL. Now to decide what to do... 😅

@@BrandonNop I ended up going with L and it fits perfectly.

5'6"