Nothing that a towel and some paper towels didn?t remedy! Big issue was after around 2 hours kept beeping repeatedly. And then I promptly jump all over him because it smells so good (like seriously, are there pheromones in this?! Like walking on a cloud (I would imagine). I?ve never ever ever worn Crocs before! Probably the coolest and best gaming keyboard out there! Being able to swipe the volume up and down, going back n forth between songs when Im listening to spotify, and even being able to triple tap to open spotify. **if you found this review helpful please mark the review appropriately:) thank you! I did not like that it took about two weeks for the slippers to stop leaving black scuff marks on my linoleum floor. Go for it!