I have the Tekna set which look just like the Mark Todd leather set but are a lot cheaper... They don't look synthetic at all and clean up really well with just a sponge or a baby wipe!!
I have the Mark Todd ones, as I was given a pair - but tbh not too impressed with them and wouldn't buy them myself. On my horse (don't know about anyone else's though!) they sort of flare out around the fetlocks, so don't sit snugly. Also scuff quite easily and the like!
Antares are gorgeous but very pricey, CWD are nice too and a bit cheaper i think. Just ordered a tekna set as thought they looked a right bargain so glad to hear they're nice