We have da brim and it seems soft enough that it would not deflect your head in any way in a crash, and it's not so tightly attached to the helmet that it will give grip to the ground and yank your helmet around that way. The biggest issue we have had with it is getting it to sit flat. The curve of the edge wants to undulate - front right a little higher than front left, adjust that and it goes the other way. Definitely suggest buying at LBS and having someone who has done it before attach it for the first time.