<p>There’s also a price point issue to consider. For example, in the Patagonia brand, the Capilene 2 Base layer pants (Polartec Power Dry) are $49. </p>
<p><a href=“Men's Baselayers, Thermal & Long Underwear by Patagonia”>Men's Baselayers, Thermal & Long Underwear by Patagonia;
<p>The same thing in merino wool blend (77% wool, 18% capilene, 5% spandex) are $90:</p>
<p><a href=“Men's Baselayers, Thermal & Long Underwear by Patagonia”>Men's Baselayers, Thermal & Long Underwear by Patagonia;
<p>So, you are looking at $100 for a set of top and bottoms versus $180. The 100% synthetic Power Dry will typically last a bit longer and wick moisture/dry a little better. The Merino wool is generally a bit warmer, but my experience has been that even the lightweight base layers are too hot more than they aren’t warm enough.</p>
<p>Here’s REI’s comparison chart, PowerDry vs Merino wool:</p>
<p><a href=“http://www.rei.com/learn/expert-advice/underwear.html”>http://www.rei.com/learn/expert-advice/underwear.html</a></p>
<p>For my purposes, the synthetic is better because I get wet (from sweat) while hiking or snow shovelling, even with temps in the teens. The PowerDry wicks moisture and dries quicker.</p>
<p>If you want to spend some serious coin on long underwear, I can’t sing the praises of the Capilene 4 enough…PowerDry High Efficiency. It’s a shear gridded fleece. Little thin grids of ultralight fleece held together by nearly shear fabric. You get warmth and very high breath abilty. I wear hoodies of the stuff (Patagonia and Marmot) as my only top layer, I mean, literally my only shirt (no jacket) or over a polyester t-shirt while snowshoeing with temps in the 20s. And, I wear it as camping PJs with temps in the 50s and as winter PJs at home with the temp set to 60 at night. It’s insane the range of temps it covers. </p>
<p><a href=“Men's Baselayers, Thermal & Long Underwear by Patagonia”>Men's Baselayers, Thermal & Long Underwear by Patagonia;
<a href=“http://marmot.com/products/details/thermo-hoody”>http://marmot.com/products/details/thermo-hoody</a></p>
<p>Not for big guys, though. It’s skin tight.</p>
<hr>
<p>I just don’t think the average guy is going to wear long johns very often, no matter what. One set of lightweight baselayers is OK, but I wouldn’t count them as winter essentials unless the guy is doing winter sports or going to winter football games or something. They are only going to be worn on the coldest days. I do think one set worn under jeans is a more flexible combination than the fleece lined jeans.</p>