Conventional
- Foot
- One sock
- Shoe
One continuous sock around the foot.
Toe sock
- Individual toes
- Separate toe sleeves
- Shoe
Fabric separates the toes; check space between and around them.
Removable liner
- Foot
- Liner
- Outer sock
- Shoe
Two separate garments, two care and rotation decisions.
Double layer
- Foot
- Built-in inner + outer
- Shoe
Layers stay together as one sock.
Waterproof membrane
- Foot
- Inner knit
- Membrane
- Outer knit
- Shoe
A membrane sits between knits; an open cuff can still admit water.
A removable liner
Two separate socks give you an inner and an outer that can be removed, washed and rotated separately. Read both compositions and both care instructions. Injinji’s liner-and-hiker set is one example.
A double-layer sock
One product joins two fabric layers. Wrightsock’s Adventure Crew lists separate synthetic inner and outer blends. It does not provide the same independent pieces as a removable liner system, even though both involve two layers.
Separate toe sleeves
A toe sock gives each toe its own sleeve. Injinji offers both a cushioned trail crew and a lightweight liner in this shape. Toe construction alone does not tell you cushion level, material or whether it is intended as an inner layer.
Anatomical left and right
Left/right constructions are another category. They should be worn on their marked foot; they do not necessarily have separate toe sleeves. Feetures Trail Max and Icebreaker Hike+ provide distinct synthetic and merino examples.
Choose by the work you want to do
Ask whether you want removable layers, individual toe sleeves, one paired left/right construction or simply a different material. Then check size, shoe space and care. Do not choose based on an unverified claim that one category prevents blisters.