Heimdall Extrafine Merino Baselayer

When to use — Skiing, trekking, mountaineering and climbing as a first layer. The quarter zip and athletic fit make it equally wearable as a standalone on mild days or in town.

19.5 micron extrafine — why it matters — Micron count measures fibre diameter; 19.5 is at the finer end of the extrafine range, thin enough to lie flat against skin without the prickling of standard merino. Finer fibres = softer, better next-to-skin comfort.

Core-spun construction — A polyester core inside each yarn adds durability and faster drying without compromising the softness of the merino outer. It also adds stretch and shape retention that pure merino lacks over time. The PBT polyester variant provides better elasticity and moisture recovery than standard polyester blends.

Pointelle panels — Open-knit ventilation zones at sides and underarms are body-mapped to where heat and moisture build fastest during output, allowing the base layer to breathe actively rather than relying solely on the merino’s natural wicking.

Quarter zip — Reverse coil auto-lock YKK® quarter zip allows rapid venting during output. Double-layered rib collar adds warmth at the neck. Ribbed cuffs seal against wind ingress at the wrist.

Ethics — Non-mulesed merino wool throughout.

Fabric
90% extrafine merino wool (19.5 micron, non-mulesed)
10% PBT polyester core-spun
Birdseye mesh knit construction
Body-mapped pointelle ventilation panels at sides and underarms

Zip
Reverse coil auto-lock YKK® quarter zip

Collar & cuffs
Double-layered ribbed collar
Ribbed cuffs

Weight & fit
260g (men's medium). Athletic fit

Ethics
Non-mulesed merino wool

Care
Machine wash 30°C — gentle wash
Dry flat
Cool iron if needed
Do not tumble dry, do not dry clean, do not bleach