661 Veggies are cr@p. They don't fit properly and do lose their way once the riding gets rough. Nothing comes worse than an elbow pad on your wrist while you bombing a trail. Also if you crash, god save you if you weared them over bare hands without long sleeve jersey covering on top. All soil and stones will dig right inside of them between the pad and your hand. Crashed with them couple of times and don't trust them anymore, I mean literaly there is no protection at all cos of that poor fit.
Myself thinking now for aggresive XC to buy something more suitable, maybe even a discreet arm+elbow pads. Had way too many scratches and a nasty ones near elbows.