finetrack Merino Spin Socks EXP

An extra-thick model that keeps your feet warm through winter mountaineering and stays comfortable on long walks

finetrack's Merino Spin Socks EXP is the extra-thick sock with the highest insulation in the series. A length matched to winter mountaineering boots, combined with full pile cushioning on the sole, holds down cold and impact while balancing resistance to stuffiness with resistance to losing shape. It's a sock built to support long hours of activity in harsh cold.

Extra-thick, with full-pile cushioning on the sole, to hold down cold and impact

The sole uses a full-pile construction. The thick pile fabric takes on your body weight and the impact of each step, easing the cold that rises from underfoot. The length is matched to winter mountaineering boots too, gently taking on contact from the boot tongue and cuff to raise comfort inside the boot.

The springy cushioning eases the load of each footfall, making it easier to hold down the toll on your feet over hard ground or a long descent. Beyond the warmth from its thickness, the impact absorption and gentle contact both add to overall walking comfort.

Unshrunk merino and nylon in "Nylon Merino Spin®" yarn, for strength and comfort

The 2022 fall/winter renewal changed the material to Nylon Merino Spin® yarn, combining nylon with unshrunk natural merino wool. This raised abrasion resistance, so it resists losing shape even on long expeditions or through repeated use, while fit and wearing comfort are also improved. It draws on wool's comfort while securing the material strength that winter mountain trips with plenty of activity demand.

Highlights of the 2022 renewal

Alongside the stronger yarn, the renewal redesigned the knit pattern from scratch. Details such as flat linking at the toe and a wide cuff elastic were all revisited, raising wearing comfort and fit even further. This improved the balance of material strength, cushioning, and resistance to stuffiness, polishing how the sock performs as a winter piece.

Temperature and moisture regulation to hold down stuffiness, and a three-dimensional design that resists slipping

Merino wool's temperature and moisture regulation is designed to ease stuffiness even when you keep sweating. A three-dimensional design built on a knit pattern redesigned from scratch resists slipping while holding down excessive tightness, cutting stress during walking. The maker describes it as achieving a dryness that ordinary wool socks can't deliver.

It resists stuffiness even through long hours of activity, and its resistance to losing shape holds up over multi-day expeditions, so it's easy to keep its condition through a run of consecutive days. The hold is set to stay low-stress, and the good fit carries through to stability across the whole foot.

A length and comfort matched to winter mountaineering boots

The length is matched to winter mountaineering boots, reaching solidly up to cover the calf. The cuff follows gently with a wide elastic, holding down localized tightness while still resisting slipping. It's built to take on friction from the boot tongue and cuff, so contact inside the boot is less likely to bother you.

A double approach to controlling odor

Wool's natural odor-resistance is combined with a deodorant-treated yarn, holding down both the onset and the lingering of unpleasant odors. It's easier to stay comfortable even on long days out or multi-day mountain trips.

Details that take care of your feet

• Flat linking at the seam above the toes resists bunching
• A wide cuff elastic gives a gentle fit
• A three-dimensional pattern holds without slipping

Together, these details raise both the insulation and the comfort that a thick sock needs to deliver, aiming for a wearing feel that holds up through repeated walking and putting the sock on and off, while easing pressure points on the foot.

A guide to sizing and the lineup

It comes in a unisex XS/S/M/L lineup, built to a length matched to winter mountaineering boots.

Being unisex, it's an easy lineup to choose from regardless of gender, based on your actual foot size and preferred fit. Depending on your boot's volume and how you wear it, it's worth weighing the fit against the thickness as well.

Care notes

To keep it light and functional, a delicate knit fabric is used. Please take care, as repeated friction, catching on hook-and-loop fasteners or branches, and contact with hard objects can cause damage.

Specifications