Best Thermal Underwear Sets for Women of 2025

"I have never owned long John's until now, and I was pleasantly surprised. They fit perfectly—form-fitting without being tight. The fabric feels like a soft, fluffy cloud hugging my body. I’m so happy with my purchase that I haven't taken them off since I got them!"

"I wore these under my jeans in 40-degree weather for a couple of hours, and they kept me nice and warm. I’m 5'3" and weigh 190 lbs, and the 2X fit nicely. I appreciate how smooth they feel and that they aren't bulky at all!"

"Initially, I ordered a set in gray and loved it so much that I ordered three more in different colors. However, when I received the black set, there was black dye all over the packaging, and it transferred onto my hands and chair. Despite this issue, the gray set remains my favorite."

“I bought this for an outdoor cold weather event. Layered nicely. It felt a little tight when I first put it on, but it does stretch out. Sizing is accurate.”

“I'm really happy with these. They’re soft and warm. I got the Smoke Heather in LARGE. The pants fit perfectly, and the top is only slightly loose. I wore them under my clothes outside and they worked well as a base layer.”

“I wanted some thermals to lounge in. I usually wear a small, so I ordered these in a Small as well. The fit was strange. The pants mostly fit, but the waistband is really skinny. The shirt felt like I was going to hulk out of it. I exchanged it for a Medium.”

“I've known about Cuddle Duds for ages, but I had never owned any until now. This winter, with the cold setting in, I needed better layers than the thin cotton shirts I was wearing. These are incredible! The fabric is extremely soft, stretchy, and so comfortable. I'm tall with long arms, and while the sleeves are decent, the thumbholes aren’t quite right for me. However, the body length is generously cut, and I stay warm all day. I bought the light blue, and it looks great!”

“I’m heading to the UK in February and needed thermal underwear to keep warm. After trying a few brands in size large, I found Cuddle Duds to be the best. They’re incredibly comfortable and warm, with plenty of give. I plan to order more as I can even use them as winter pajamas. They were just a bit pricier than the others, but totally worth it.”

“I absolutely love my gray Cuddle Duds! They keep me warm and comfortable all day. Washing them is a breeze, and they fit true to size. Living in the Upper Peninsula of Michigan, where we get lots of snow and sub-zero temperatures, having these is essential for winter.”

"My Ekouaer Thermal Long Johns Set is fabulous! Living in Atlanta, I find them great for both winter climates. I'm 5'3 and 150 pounds, and the LARGE fits snug yet breathable. The soft and luxurious fabric keeps me warm under clothing. The rich blue color looks classy. I highly recommend these long johns!"

"Initially, I hesitated due to mixed reviews, but I’m so glad I bought them! Yes, they feel thin, but that's typical for long johns meant to be worn under clothes. The soft and silky material feels amazing against my skin, and they keep me warm yet breathable. I've even adjusted my thermostat lower, saving on energy bills. I can’t recommend these enough!"

"I really like this thermal set. It's warm without being too thick, making it comfortable to wear under pants. The fit is perfect for my needs."

"I absolutely love these! They are extremely warm, butter soft, and breathable. I wear them under my uniform while working outdoors, and they are just perfect! I plan to buy more and highly recommend them!"

"These pants are so soft and cozy! I find them true to size, though the bottoms can feel a little bulky under jeans. They are still great for lounging around the house."

"I think these are great for layering! They are soft on the inside and pretty lightweight. I wear them as pajamas during cold months, but they might need more layers for temperatures below 20 degrees."

"At 5'5” and 150 lbs, I got a medium, and they fit just right. They look small but have plenty of stretch. I find them very comfortable and of good quality. They wash well and keep me warm. I'm definitely buying another pair!"

"I really love these! They are extremely warm and keep the cold air out while I work outside. They also fit well under my clothes."

"I usually freeze when skiing, even with layers. But with these thermals and just one layer on top, I was sweating during a blizzard! I should have bought them sooner -- 10/10!"

"I recently bought these fleece lined PISIQI thermal underwear, and I couldn't be happier! The fit is perfect, snug but not restrictive. The material is soft and comfortable, making them a pleasure to wear all day. I'm especially impressed by how warm and cozy they are, even in freezing temperatures. They're also durable and wash well, maintaining their shape after multiple uses. If you're looking for thermal underwear that combines great fit, warmth, and comfort, I highly recommend these. They've become a winter essential for me!"

"These are the best thermals I've purchased! The inside and out is super soft. I’m 4'11", so the pants are a little long, but they fit like stretchy leggings. They're stylish enough to wear all day and look expensive. They wash well too; I’ve had no pilling issues. I accidentally dried them on low heat, and they didn’t get ruined, which is a plus! I will still follow the manufacturer's instructions to lay them flat to dry, just to be safe."

"Well, I wore them one day, then I ordered a pair for my sister and another for myself! They’re comfy, not bulky, and kept me warm. I’m very happy!"

"These thermals are incredibly comfortable and warm; I'm so glad I decided to buy them."

"I found them to be nice and warm, definitely better than any I've purchased before, but they do run a bit small."

"As someone with curvy hips and fuller thighs, the bottoms were a little snug; I typically wear L/XL. They lack stretch, so I’d suggest sizing up for more room. The shirt fit perfectly, though!"

"I loved this product! The fabric is incredibly soft and really keeps me warm during the winter. I highly recommend it!"

"I recently found the perfect fit! I’m a woman, 5ft6in and 190lb, and the XXL fits me perfectly. It’s very comfy and cozy, and I love that I can pull the pants up above my belly button!"

"During my time in Canada, it helped with the cold when it was snowing, but I still felt quite chilly in strong winds. I recommend checking the temperature specifications, as the clothing has labels indicating its intended temperature range. It’s well-made and very soft."

"As someone who often battles the cold, the WEERTI Thermal Underwear has become my secret weapon. It feels like a warm hug, thanks to its ultra-soft fleece lining. The fit is adjustable and snug without being restrictive, making it easy to layer under any outfit. Whether I'm hiking or lounging, it keeps me cozy. My only wish is for a bit more breathability during intense activities. Overall, it's a fantastic choice for winter!"

"I absolutely love these thermal underwear! They are incredibly warm and comfortable. The fit is perfect as a base layer for outdoor activities or just lounging at home. I appreciate how the material is stretchy yet breathable, without adding bulk. I highly recommend this set for anyone needing reliable cold-weather gear!"

"This thermal set is exactly what I needed! It fits true to size and is made from high-quality fabric. The silky feel and lightweight design means no added bulk under my jeans. I ordered them for an upcoming Alaskan cruise, but I can see myself wearing them all winter long at home. What a fantastic bargain at 50% off!"