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This product is no longer available, but don't go just yet.


  • Non-pilling polyester fleece draws moisture away from the skin and dries quickly
  • With a UPF 50+ rating, fabric provides excellent protection against harmful ultraviolet rays
  • Elastic waist; gusseted crotch; flat seams


View all REI Kids' Long Underwear Bottoms

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Best Use Multisport
Fabric Polyester
Sun-Protective Fabric Yes
Moisture Wicking Yes
Quick Drying Yes
Underwear Weight Heavyweight
Inseam (in.) Unavailable
Gender Toddler Boys'