Best Base Layers for Women of 2025

"For my December trip to Europe, this was the most important item I brought. The quality is comparable to Smartwool, and it kept me warm and comfortable. It's soft and non-itchy, so I definitely recommend it!"

"After using these for a year, I’m impressed! They’ve held up well through multiple camping trips. I washed them several times, and they still look almost new. The fit is good, but if you’re between sizes, size down. They keep me warm and are great for layering under my hunting gear!"

"I love this set! It's incredibly soft and comfortable, perfect for cold days without being restrictive. I'm so pleased that it's made from wool and not itchy at all. I highly recommend it!"

"I wear these under my tops and bottoms and they are so lightweight and comfortable that I don't even know I have them on. The quality is excellent and I highly recommend!"

"I have this shirt in every color they make. It is the perfect winter layer and really traps heat well. It's fitted but very stretchy, so it's incredibly comfortable."

"I really love the color. It didn't look cheap or like something only to wear beneath other layers. I went all day without needing a jacket, and my co-worker asked for the link to the shirt!"

"I find these tops to be wonderful. They’re soft, warm, and require easy care. They’re a must-have for layering!"

"I usually wear a medium, but I prefer the large for layering over sleeveless dresses. It's a bit looser, which I like."

"I've had the black version and love it, but the white one pills constantly. Despite that, I still appreciate the fit and warmth!"

"I think these pants are true to size compared to other wool pants. They are really comfortable and the cut fits nicely around my curves and wide hips. The thick waistband doesn’t dig into my body or twist around like others. I just got them yesterday and am wearing them today. I’ve owned a pair of a slightly different style of Smartwool's merino leggings for about a year, and they are still in great condition. I'm really glad I purchased these, even though they are a little pricey. I ended up getting a second pair because they are just that great!"

"I was preparing for a Viking festival in very cold, wintery Michigan weather. I stood outside for 14 hours a day over three days. I ordered these Smartwool thermal long johns on the Try Before You Buy program, fully expecting to send them back unused. But they saved me! The only parts of me that felt cold were my toes, fingers, and face. They are definitely worth every penny I paid!"

"I really like these bottoms. They have a great fit for slim legs and are long enough for tall people. They're comfortable to wear and look nice too. The only drawback is that the fabric picks up every piece of dust or hair. While they are good-looking leggings, I find them not warm enough for walking outside without something over them."

"I absolutely love this shirt! I wore it almost every day during my week trip to Amsterdam, and there was never any odor. It’s so comfy and warm, and I even wear it in Arizona's winter without overheating. Wool is just amazing! It washes well and doesn't shrink, which is a huge plus for me."

"I’m really happy with the XXL women's tops I bought! The midweight one is perfect—not bulky and easy to wash. I can tell my body benefits from the wool because I never feel sweaty or have body odor, even in Florida's fluctuating temperatures. The socks are great too!"

"I've tested this wool gear for a week, and I’m impressed! I’ve stayed warm without getting hot, and the fit is close but comfortable. I appreciate the softness, especially since I have sensitive skin. The small women's size fits me perfectly, but I noticed the men's version was slightly bigger."

“I love how soft and form-fitting this shirt is! At 5' 8" and 145 pounds, I went for an XL for comfort, and it really feels like a warm hug when it’s chilly outside.”

“I bought this shirt for a Christmas parade and was pleasantly surprised—it kept me warm the entire time! The material is thin and super comfortable, just as advertised.”

“As a regular wearer of this brand, I’m disappointed with the inferior material and poor stitching quality. The fit was off, and I feel like I’ve been ripped off. I wouldn’t recommend this.”

"I find these thermal bottoms perfect for layering under my jeans. They are thin but warm, great for chilly days, and I can wear them comfortably throughout the day."

"These leggings are absolutely amazing! They keep me warm down to about 35 degrees when worn under my work jeans. I ordered an XXL, and they fit just right."

"I just bought my second pair. They are soft and stretchy, and although they are thin, they are not bulky under my pants. I could feel some cold air while wearing them, but they are still great for sleeping comfortably."

"I chose the XXL because I wanted a loose fit, but I think I could have managed with L. These leggings are classy and of great quality. They’re not itchy, and I appreciate that wool works well in both heat and cold. They’re slightly loose but stay on well. I'm planning to buy more!"

"I bought these for my wife, and she loves them! While I wish they were cheaper to buy a second pair, the quality is fantastic. They keep us warm without any odor after washing. We hand stretch them before air drying, and the fit is just right!"

"I wore these leggings while snowmobiling in zero-degree weather, and they kept me warm the entire time. I usually dread the cold, but these changed my experience completely. The quality is outstanding, and they’re not itchy at all. Plus, the free socks were a nice touch!"

"This top is a perfect fit and very flattering. I absolutely love it!"

"I use this as a thermal for work and also when I sleep. I really wish there were more like this with thumb holes in softer materials."

"I ordered an XL hoping for a loose fit, but it wasn't as loose as I expected. I wish I had gone up a size, but the material feels decent."

"I found the price well worth it; the material is very good, warm, and snug. It's definitely thick enough for 40-degree weather."

"Living in NY, I’ve worn one every day and night this winter. They are well made, soft, and warm, but I wish I had ordered a large instead of a medium."

"I’m really impressed with the material, fit, and feel! I bought the medium size and wear them constantly while riding my motorcycle; they keep my chest and arms warm from the cold air!"