10 Best Long Underwear For Women 2025 in the United States

The Cuddl Duds Thermal Underwear for Women is designed to keep you warm during cold weather, featuring a brushed fleece inside for extra coziness. The set includes a thermal shirt top and leggings pants, both made from 93% Polyester and 7% Spandex, which offers a good balance of comfort and stretch. The spandex stretch ensures flexibility and ease of movement, making this set suitable for various activities.

Additionally, the densely knit fabric provides 50+ UV protection, adding an extra layer of safety from harmful rays. The thumbhole sleeve top and modern rise leggings contribute to a comfortable fit that stays in place. However, the heavyweight fabric may not be the best choice for milder temperatures as it could feel bulky. The moisture-wicking feature helps manage sweat by absorbing and evaporating moisture, maintaining dryness. Yet, there is no specific mention of odor resistance, which is a potential downside for those looking for prolonged wear without the smell.

The seams and construction appear durable, enhancing the longevity of the product. This thermal set is versatile enough to be worn as a base layer or on its own, making it ideal for both outdoor activities and lounging at home. Machine washable for easy care, it combines practicality with comfort effectively.

The Amazon Essentials Women's Waffle Snug Fit Pajama Set, made from a 60% cotton and 40% polyester blend, is designed to provide a cozy and comfortable experience. The waffle knit fabric is both breathable and soft, making it a versatile choice for different seasons. The slim fit design ensures the pajama set sits close to the body, with a snug fit through the torso, hips, and thighs. This can be beneficial for heat retention during cooler nights, although it might feel too tight for some looking for a looser fit.

In terms of material, the cotton blend offers decent moisture-wicking properties, which helps in maintaining comfort by preventing excessive sweating. The construction features ribbing on the neckline, cuffs, and ankles, providing flexibility and ensuring a secure fit. The set's weight is lightweight, making it easy to wear without feeling bulky, ideal for layering under clothes. However, it might not provide sufficient warmth as a standalone for extreme cold conditions.

The seams are well-constructed, enhancing durability, but there's no specific mention of flatlock seams, which are preferred for reducing skin irritation during prolonged wear. Odor resistance isn't explicitly highlighted, so users who prioritize this feature might find it lacking compared to specialized long underwear. The convenience of a pull-on closure and machine washability adds to its ease of use. This pajama set could serve well as a basic layer for mild to moderate temperatures, appealing to those who value comfort and simplicity in their sleepwear or casual lounging attire. However, those needing advanced features like superior moisture management or high odor resistance might want to explore other options.

The Grenasasilk Women's Silk Long Underwear is crafted from 100% natural mulberry silk, known for its softness, lightweight, and breathability, making it suitable for cold weather. The material is hypoallergenic and gentle on sensitive or allergy-prone skin, which is a significant advantage for many women. Additionally, silk's anti-static properties enhance comfort.

This underwear set includes both top and bottom pieces with a snug, second-skin fit that allows for comfortable movement. The knitted fabric's elasticity ensures it molds to your body shape, providing an additional layer of warmth under your clothes or serving as cozy sleepwear. The seams and construction appear well-made, helping to maintain the garment’s shape and durability over time.

However, silk generally requires delicate care; the manufacturer recommends using neutral detergent and either gentle machine wash or hand wash, followed by air drying, which might be somewhat inconvenient for those looking for easy maintenance. Silk is also not the best at moisture-wicking and might not perform as well in high-sweat activities compared to synthetic blends. It does offer good breathability, helping regulate body temperature. Odor resistance is moderate; while silk does not retain odors as much as some materials, it isn't as effective as merino wool. This set is ideal for women seeking luxurious, skin-friendly, and warm base layers for everyday cold weather wear or as sleepwear, but might not be the best option for high-intensity activities or those seeking low-maintenance care.