SlumberPod The Original Blackout Sleep Tent Travel Essential for Babies and Toddlers, Mini Crib and Pack N Play Cover, Sleep Pod for Kids with Monitor Pouch and Fan Pouch, Blocks 90% Light, Navy

These are great! We have three girls under the age of four that are sharing a room, and these have been a dream. We bought them mainly to keep our girls contained so they're not crawling out of their cribs to play after we put them to bed, and we LOVE them for that. They're also blackout which is great for when I need to move around inside the room when they're sleeping and for blocking out light during naps. The material is fairly breathable. There have been a handful of times where my girls have woken up in a puddle of sweat, but it hasn't been a consistent issue. There are vents on the tent to allow more air to circulate. The only downside to these for us is that we travel a lot, and they're not the most convenient thing to constantly set-up and tear-down. Outside of that, they're compact and lightweight, so they do pack nicely.