The String Nix Edit — women's underwear

Woman relaxing at a luxury spa, illustrating comfortable underwear choices for a spa day, travel and relaxed clothing.

What Underwear Should You Wear on a Spa Day?

A spa day should feel effortless, right down to what you wear underneath. Here’s how to choose comfortable, smooth underwear that works under robes, leggings and relaxed clothing.

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String Nix model wearing white organic cotton string thong underwear for National Underwear Day 2026

National Underwear Day 2026, Time to Upgrade Your Everyday Underwear

It is National Underwear Day, the perfect excuse to rethink what sits closest to your skin every day. Better fabric, better fit, less bulk and underwear you genuinely want to wear.

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