Best Thermal Underwear Sets for Girls of 2026

"As a stay-at-home mom, I found these thermals to be a game changer for winter. The thick, soft, and stretchy fabric keeps my toddlers warm without restricting their movement, and the fit stays perfect even after several washes. I also love the moisture-wicking and simple design, making them ideal for any activity or layering. These are now my go-to for keeping my kids comfortable during cold months."

"I purchased this set for my child and was impressed by the exceptional insulation and softness. The material is comfortable and never bulky, so my little one can still play and move easily. Even after a day outdoors, she stays warm but not overheated. The durability and fit are spot-on, and I highly recommend this thermal set to other parents looking for quality winter wear."

"These thermals have been perfect as a base layer for my toddler. They’re super soft, cozy, and fit just right. The material holds up well after washing, and I love how easy they are to layer under regular clothes. Definitely planning to buy more for the colder months."

"I've bought several thermal sets for my daughter, and these are by far the best quality. The lining remains soft after lots of washes and doesn’t pill. The waistband is oddly designed but way more comfortable than the typical elastic bands. They're warm but not too hot, making them a really good buy."

"My daughter absolutely loves the softness and comfort of these thermals. She wears them as pajamas and even under her Halloween costume. The vibrant colors are a plus, and the fit is true to size. She says they're buttery soft and wants to wear them all the time."

"I needed something durable and comfortable for my daughter’s hockey practices, and these thermals delivered. She adores wearing them, and they've held up extremely well so far. I appreciate how well they combine warmth, quality, and a kid-friendly design."

"I purchased two sets for my boys for a winter camping trip, and they fit true to size, are thin yet surprisingly warm, and the color matched the photos perfectly. My kids slept comfortably through chilly nights!"

"After months of use and multiple washes, this set has held up impressively well—it hasn't shrunk at all and is still super soft and comfortable. My child stays warm and happy every time he wears it."

"This is honestly the best set we've ever bought. They're lightweight, warm, soft, and durable—plus, they're a great value. They feel fantastic under clothes and are easy to wash. I plan to buy more as my kid grows!"

"I bought these for my 9-year-old and she absolutely loved them. She didn't want to take them off and wore them under her costume during a chilly parade. Kept her perfectly warm!"

"My almost 6-year-old wears these and they fit really well. The material is thick, stretchy, and comfortable—ideal for layering in colder weather."

"These sets are a hit with my granddaughter. She loves them, and I’m confident they’ll keep her warm during our Colorado Springs trip. Definitely worth the purchase."

"I bought two sets of these thermals for my daughter to use during skiing and other winter activities, and I’m really impressed. The material reminds me of the durable military thermals I used to get, with a microfiber pile inside that doesn’t pill or ball up. The fit is great, offering room for growth and comfort, and my daughter actually enjoys lounging in them after a day on the slopes. She stays warm outside and never feels overheated inside. I’d definitely buy these again and recommend them to others."

"My daughter is a long-distance runner, and these thermal underwear have been a game-changer for us. They’re thin enough to wear under leggings but still provide total warmth, even in 20-degree weather. She loves the super soft fleece lining inside, and after trying several other brands, these are the only ones we kept. We’re so happy with them, we’ll be getting more for ski season."

"I was looking for something my daughter could wear to school outdoors all day, and these worked perfectly. They fit well and are slim enough to layer under her clothes without being bulky. The fleece lining is cozy and warm, and we liked them so much that we ended up ordering additional colors. Great quality for outdoor activities."

"I picked these up for a long flight thinking my daughter might get chilly, and they were absolutely perfect for travel. They've quickly become her go-to pajamas, and I plan to get more. I already own a few pieces from this brand and love every single one."

"My daughter absolutely adores these pajamas—they're incredibly soft and cozy. Out of all her sleepwear, these are by far the softest pair she owns."

"The princess print is super cute, and my little girl is a big fan. The material is a bit thinner than I expected, so I'm unsure how warm they'll be on their own."

"I bought this thermal set for my 4-year-old daughter and it’s quickly become her absolute favorite winter outfit. The fleece lining is plush and warm, and the material stays soft and breathable, even during indoor play. I love how it fits perfectly under her sweaters and snowsuits, and the stretchy fabric never restricts her movement. It’s so versatile, we use it for school, play, and even bedtime—definitely planning to buy another!"

"This set is super warm and comfortable for my toddler, and the quality is impressive for the price. It’s ideal for layering during our cold Chicago winters, and my child fits perfectly in it. Highly recommend for any parent looking for value and coziness."

"I got this set to wear under my son’s Halloween costume, and it was perfect for keeping him warm all night. The fabric is unbelievably soft—I honestly wish they made these in adult sizes!"

"My granddaughter is thrilled with these—she loves the fit and comfort! I’ll definitely be picking up more in different colors. My only small concern was the packaging, since it was clear and showed what was inside, which isn’t ideal during the holiday season."

"I purchased these specifically for my daughter’s outdoor adventures in northern Finland’s deep snow. They kept her warm and dry for ten days, and the fit was perfect. The fleece is super soft and cozy, and the quality seems excellent."

"Both my granddaughters adored these thermals! They stayed warm even in windy, 25-degree weather out hunting, and they love wearing them as pajamas too. They’ve already asked for more as they grow—soft and comfortable all around."

"I absolutely love how soft and warm these are! My daughter wore them under her costume for Halloween, and the fit was perfect for layering. I sized up for a looser fit, which worked great since kids grow fast."

"My daughter is a fan of these thermals. They’re thick enough to wear as pants on their own and have held up well in the wash—no pilling at all. She keeps telling me how warm and comfy they feel."

"We got these for Halloween when it was unexpectedly cold, and they kept my daughter nice and warm while trick-or-treating. The only thing was that the 'white' color turned out to be more cream than white, but we made it work."

"This thermal set is a must-have for winter! The fleece lining is incredibly soft and keeps my daughter warm without bulk. I love the 3-pack value—perfect for everyday layering. They fit true to size, stretch comfortably, and hold up well in the wash. I highly recommend them for their warmth, quality, and price!"

"I've purchased from this brand twice now because these thermals are very warm, durable, and form-fitting. They really keep the chill out and are adjustable for comfort. My child is always happy wearing them."

"My daughter actually loves wearing these—they're super soft and comfy. She even uses them as pajamas around the house! The fleece lining is thin, so it's not quite thick enough for Seattle nights alone, but still a great layer. The bottoms fit more like loose pants than leggings."