Men's 100% Ultra Pure Cotton Long Johns Heavy (240 GSM) Soft Underwear (Thermal Underwear) Ref:1190

Product Information

Most manufacturers reserve the term “expedition weight” for their heaviest base layers. Merino base layer weight is expressed in grams per square meter of fabric. Ultralight base layers are made of 150 g/m2 fabric, while anything over 250 g/m2 is considered heavyweight. If you’re going ice fishing or doing anything in extremely cold conditions, get long johns designed for such use. Hunting Smartwool has a large selection of top-tier base layers to choose from. The Smartwool Classic is an excellent choice for anyone, and we chose it as the best overall due to the fit, comfort, and range of motion available with the materials. They used to be made from 100% Merino, and the nylon core changed the overall feel of the leggings. Note: Smartwool still has products made from 100% Merino if the feel of these isn’t quite right. These Smartwool base layers were comfortable to wear while hiking, camping, and playing with my pup. Meg Carney While lambswool is warmer than merino wool, it’s too scratchy to be worn next to the skin. To be effective, a base layer has to fit closely enough to carry away moisture but should be flexible enough not to restrict your movement. For the price, they are a great option. They’d be warm enough for more stationary activities in cold weather, or if you’re looking to buy some layers for kids bound to tear things up or outgrow them, these will save you some money. Overall, the comfort and fit are decent, but I wish the waist stayed in place a bit better while hiking. What to Consider When Choosing Long Johns

Extreme cold demands heavyweight base layers. The natural loft of merino wool traps air very efficiently, making it warmer than synthetics of equal weight. While synthetics may dry faster, merino is warmer and more comfortable when it does get wet.Long johns and by extension, other base layer categories, almost always have their fabric weight rating listed somewhere. The categories might not be hard-cut but are a dependable place to start your search barring no strong specific preference.

OX10 Lovely fabric Very comfortable to wear. Have washed and tumble dried no problem. Also washed and dried on airer no problem.Although there are full Merino base layer options from Smartwool, the nylon core adds to the durability and longevity of the garment. We also like that while they are made from mostly wool, the care is relatively easy. You can wash and dry these on a low setting, but we recommend hang drying even Merino wool products to increase longevity. Learn more about Merino wool care.