They prevent my little boy's arms and legs from getting caught between the cot slats. It's breathable too, so I don't have to worry about him choking in it if he puts his face against it. It's not bulky at all. The only downside I have is that when he gets on the crib he pushes the bumper down. The bumper attaches with velcro around the edges and side, but ties together in the middle.
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