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Guide

Base layer sets

Check chest, hips and leg length separately. A set works when both pieces fit closely and you want similar warmth for your upper body and legs.

Key points

  • Both top and bottoms must fit your measurements.
  • Choose lighter fabrics for hard efforts.
  • Weigh merino for longer wear against synthetic for quicker drying.
  • Keep trouser cuffs from bunching inside tall boots.

What suits your day?

UseChooseBear in mind
Brisk activityChooseLight synthetic fabricBear in mindIt takes up little room beneath the next layer and dries quickly after exercise.
Cold days with stopsChooseA warmer wool blendBear in mindPlan the thickness with your jacket and trousers to avoid overheating on the move.
Several days awayChooseMerino or a wool blendBear in mindAir the pieces in the evening and let them dry fully before packing.
Changing paceChooseA stretchy first layerBear in mindClose fabric follows your movements and forms fewer folds beneath other clothing.

What to look for

QuestionIn briefWhy
Do both pieces fit?In briefRead the size chart separatelyWhyUse chest and torso length for the top, and hips and leg length for the bottoms.
How much warmth?In briefConsider your effortWhyWarm underwear helps at a gentle pace; the same thickness can trap too much heat during harder exercise.
Which leg length?In briefMatch socks and bootsWhyA trouser cuff over a sock can press inside a tight boot. A shorter leg leaves that area clear.
How should the waist fit?In briefSoft without digging inWhyBend and squat. The top should keep you covered and the bottoms should stay in place without pressure on your stomach.

Common questions

When are separates better?

When your top and bottoms need different sizes, or your torso needs more warmth than your legs. They also let you combine shorter bottoms with a long-sleeved top.

Should base layers be tight?

They should follow the body without pulling. Large folds can rub beneath other layers; a tight waistband or tension across the shoulders makes movement uncomfortable.

Is a set warmer than separates?

Warmth depends on fabric, thickness and the rest of your layers. Consider how hard you will work and how long your stops will last when choosing the weight.

How do I wash a set?

Read both care labels. Wool often needs a different programme from pure synthetic fabric. Dry gently and check that seams and waistbands are fully dry before packing.

Last updated: November 2026