At The Cambridge Sock Company, we've built our name on natural comfort — socks made in England from fibres that do the hard work so your feet don't have to. Two of our most-loved materials, alpaca and merino wool, both deliver warmth, softness and all-day comfort, but they get there in different ways. If you've ever stood on a collection page trying to decide between the two, this guide (and the interactive tool below) will settle it in a couple of minutes.

Try it yourself: Drag the sliders below for your typical day — hiking, cold weather, moisture, sensitive skin — and watch the scores update in real time.

The quick verdict

• Choose alpaca if you feel the cold easily, have sensitive skin, or want the warmest, softest sock in the drawer for winter walks and cosy nights in.
• Choose merino if you're active, on your feet all day, or need a sock that handles changing temperatures and keeps working hard through hikes, commutes and everything in between.
• Can't decide? Our alpaca-merino blends give you a bit of both — alpaca's warmth and softness with merino's stretch and moisture handling.

Warmth

Alpaca fibre has a hollow, or semi-hollow, core that traps more air than merino's crimped structure — gram for gram, it's often quoted as up to 30% warmer. That's why it's our go-to recommendation for genuinely cold feet, damp British winters, and anyone who runs cold no matter how many layers they put on.

Merino isn't far behind. Its natural crimp still delivers excellent insulation, and it's better than alpaca at preventing that clammy, overheated feeling when you're moving between warm and cold environments — in and out of the car, office to street, uphill to downhill.

Winner for pure warmth: Alpaca
Winner for changeable conditions: Merino

Softness and feel

Alpaca is prized for a smooth, almost cashmere-like softness — its flatter fibre scales mean less of the "prickle" some people associate with wool, even at a slightly higher micron count. It's the fibre we reach for in our most indulgent, treat-yourself styles.

Fine merino is exceptionally soft too, and more consistent fibre-to-fibre than standard sheep's wool, though a small number of wearers find it a touch pricklier than alpaca against bare skin.

Winner: Alpaca, by a whisker — though fine merino comes very close.

Moisture and odour management

This is where merino pulls ahead. It can absorb up to 30% of its weight in moisture while still feeling dry against the skin, wicking sweat efficiently and drying faster — ideal for long days on your feet or anything active.

Alpaca absorbs less moisture (around 10% of its weight), which keeps it feeling drier for longer in cold, damp conditions, but it's slower to dry out fully once it does get wet.

Both fibres are naturally odour-resistant, so neither will let you down on a long day — a genuine advantage over synthetic socks.

Winner for all-day/active wear: Merino
Winner for cold, damp conditions: Alpaca

Durability and fit

Alpaca fibre has real tensile strength and resists pilling well, so it holds its appearance over time. Merino is durable too, especially in quality blends, though its finer fibres can pill in high-friction spots like heels without proper care. Merino's natural crimp also gives it more elasticity, so it springs back into shape and holds a close, supportive fit — something we lean on in our more performance-oriented styles.

Sensitive skin

If wool has ever irritated you, it's usually the lanolin. Alpaca fibre is naturally lanolin-free and hypoallergenic, making it our top recommendation for genuinely sensitive skin or wool allergies. Merino contains some lanolin, which occasionally causes irritation for a small minority, though fine merino is still comfortable for most people.

Sustainability

Both are excellent natural, biodegradable choices over synthetics. Alpacas graze gently with a low environmental footprint, and because their fibre is lanolin-free it needs fewer chemical processes to prepare. Merino is renewable and biodegradable too, with impact depending heavily on the individual farm — we work with producers who prioritise animal welfare and land stewardship.

Which sock should you actually buy?

• Cold feet, winter walks, or sensitive skin → Alpaca. Our alpaca styles are built exactly for this.
• On your feet all day, hiking, or need a sock that keeps up with changeable weather → Merino.
• Want the best of both → Look for our alpaca-merino blends, which combine alpaca's warmth and softness with merino's stretch and moisture handling.

Still torn? Use the interactive comparison tool above — set the sliders to match your typical day and let the scores do the deciding.

Shop Alpaca Socks → | Shop Merino Socks →

Related reading: The Ultimate Comfort: British-Made Alpaca Wool Socks, Alpaca the New Cashmere, Caring for our Alpacas