Our son plays ice hockey and loves the mouthguard.....the second one we purchased. The product directions must be followed EXACTLY. The directions state to put the mouthguard in the water for 45 seconds. Our son left it in there closer to a minute and it was a ball of goop when he took it out, rendering it useless. We completely accept that this was our user error. Just wanted to let others know to follow the directions exactly, to save them time & money in ordering second one.