Alpaca vs Merino Wool vs Cotton: Which Fibre Is Best for Socks?

Choosing the right material for socks is less about trend and more about performance. Temperature, comfort, breathability, and durability all depend on the fibre used — yet most socks are bought without much thought to what they're actually made from.

Among natural fibres, alpaca, merino wool, and cotton are the most commonly used. Each has its strengths, but they behave very differently in everyday wear.

Cotton socks

Cotton is the default for most socks and the weakest performer of the three for anything beyond the most basic use. It absorbs moisture rather than wicking it, which means feet stay damp longer. It offers little natural insulation and wears through relatively quickly in high-friction areas like the heel and ball of the foot.

Cotton socks are inexpensive and widely available — but cost-per-wear is rarely in their favour.

Merino wool socks

Merino is a significant upgrade on cotton. Fine, soft, and naturally odour-resistant, it manages moisture effectively and regulates temperature across a wider range of conditions than cotton. It's elastic and form-fitting, which gives a closer feel to the foot.

Our Fine Gauge Merino Wool Sock is built for all-day wear in a range of conditions — lightweight enough for transitional seasons, warm enough for cooler days.

Alpaca socks

Alpaca outperforms both for cold-weather use and for anyone with sensitive skin. Its hollow fibre structure insulates more efficiently than merino at the same weight, it contains no lanolin (making it hypoallergenic), and it's exceptionally durable over time. Alpaca socks pill less, hold their shape longer, and feel noticeably softer than wool after repeated washing.

Our Peruvian Alpaca Everyday Socks are the benchmark for daily alpaca wear — warm without bulk, soft without being delicate.

The verdict

For everyday warmth and durability: alpaca wins.

For moisture management across seasons: merino is excellent.

For basic warm-weather use: cotton is functional, but natural fibre blends outperform it quickly.

For most people in the UK, where cold and damp conditions are the norm for most of the year, alpaca or merino will serve you considerably better than cotton for most of the year.

To go deeper on the alpaca vs merino comparison specifically, read alpaca vs merino: which fibre suits you best? And for our honest take on alpaca's premium, see why alpaca beats merino for luxury socks.