What each label establishes
A merino blend contains merino wool along with the other named fibers. A synthetic construction can combine polyester, nylon and elastane-type fibers. Wool-free is a material fact; a vegan claim needs its own explicit manufacturer basis.
Moisture and drying
Brands often make moisture-management claims. Those claims are not a measured drying-time comparison between the exact models here. Sock weight, layers, cushion and washing conditions also differ. In the trip planner, enter your own drying assumption rather than using the wool percentage as an estimate.
Warmth and conditions
A wool-rich full-cushion crew and a lighter synthetic toe sock differ in more than fiber. Compare weight label, padding and layers, but do not read a temperature rating into them. This guide does not award a warmest or coolest sock without repeatable exact-model evidence.
Odor and repeated wear
An odor-resistance claim does not establish how many times you can wear a pair before washing. Plan your rotation around your preferences, the actual conditions and access to washing. Keep a dry reserve separate if you want one.
Durability and warranty
A lifetime replacement promise is a policy, not a measured lifespan. Compare reinforcing zones only where the maker describes them and read the guarantee process separately. This catalog cannot turn nylon percentage into miles to failure.
Care is a deciding factor
If you need a particular wash or drying method, use the exact care instruction as a constraint. A membrane or layered system may need different handling from a conventional sock. Choose the construction you can realistically wash and dry on the trip.