Synthetic blend ski socks aren't necessarily a downgrade from merino — they just serve a different purpose. Made primarily from nylon, polyester, or acrylic with some stretch fibers, synthetics excel at durability and fast drying. If you're hard on your gear, ski frequently, or need a more budget-friendly option, synthetic blends are a solid pick. They're also the go-to if you have a wool allergy.
The trade-off is odor control and temperature regulation. Synthetic fibers don't absorb moisture the way merino does, so sweat sits on the surface and can feel clammy against your skin. They also tend to hold odors faster, which matters if you're skiing multiple days without washing.
For resort skiers who wash gear regularly and want something tough that lasts season after season, synthetic blends get the job done. But if you run cold, sweat heavily, or multi-day trips are your norm, merino or a merino-synthetic blend will likely keep your feet happier.