These do NOT leak. The reviews I'm seeing about leaks are curious to me, because I've used Ninjamas for SEVERAL kids, and they have NEVER leaked when the correct size is used. They hold an incredible amount of fluid.

[This review was collected as part of a promotion.] My 4.5 year old son has accidents on occasion. These absorbed perfectly. Were comfortable for him and he liked the design. Ninjamas Nighttime Bedwetting Underwear for Boys Size S/M

[This review was collected as part of a promotion.] My daughter loves to wear these. it is comfy and feels like boy shorts. it is a little on the pricey side but it will definitely prevent accidents. I would buy for my daughter it is amazing.

[This review was collected as part of a promotion.] They did great keeping my kiddo dry. We used every night and even bought another pack. They worked out great. We woke with dry bedding.

[This review was collected as part of a promotion.] These are great overnight disposable underwear! They are very soft and comfortable to my son. We had zero wake up calls because our son wet the bed! Will definitely buy!

[This review was collected as part of a promotion.] These nighttime underwear were a great fit on my daughter. She liked that they are not too thick like other pull-ups. Felt more like underwear and no leaks!

[This review was collected as part of a promotion.] My son has autism and has frequent accidents, and these work the best for him. Im pleased with the product would recommend again

[This review was collected as part of a promotion.] Absorbed everything, it kept sheets dry. It was comfortable and stretchy my son didnt complain one bit. Not bulky like other diapers.

[This review was collected as part of a promotion.] Okay so I have a 2 year old who wets the bed . And these were a relief they didnt get wet on the outside like most pull ups he wears . They were able to hold his nightly bet wetting so I like a lot

[This review was collected as part of a promotion.] Even though he was wearing pink for 2 weeks we really enjoyed these. they held up and didn't smell horrendous. I will be looking to potentially buy these in the future, just for a boy this time ;D