What denier tights are warm?

60 denier and above is genuinely warm and opaque. 40 is the everyday middle, 15 is sheer and decorative, and 100 or more is thermal.

Denier is printed on every packet and almost nobody uses it. It is simply a measure of yarn thickness — technically the weight in grams of 9,000 metres of the fiber — so a higher number means more material, more opacity and more warmth.

The usable scale. Up to about 20 denier is sheer: decorative, barely warm, and the range where ladders happen most. Around 40 is the everyday weight — mostly opaque, warm enough for a mild day, thin enough not to look heavy. At 60 you are genuinely warm and fully opaque, which is the number most people actually want from October onward. 100 and above is thermal and will read as a thick, matte legging rather than hosiery.

What the number does not tell you. Denier measures thickness, not fiber. A 60-denier nylon and a 60-denier wool blend feel completely different on a cold morning, because wool holds warm air and nylon does not. If the packet lists a wool, cashmere or merino content, it will be warmer than a plain nylon of the same denier.

The common mistake. Most people get caught out in September still wearing the 15 denier left in the drawer from summer. Buying two pairs of 60 before the weather turns costs very little and is the most effective warmth-per-dollar purchase in hosiery.

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