You kind of really got to make sure you get that cup in the right place and when you moving around, kicking it moves a bit. Took a kick to the you know where, not very hard and it still rattled my teeth.Its a MMA cup so kicking there is more accident than by design. I do Krav so when it comes to kicks thats the first place to go. :-)
Saying that they are awesome to wear without the cup and my krav maga guard over, stops chafing and much more comfortable than normal pants when it comes to training.