Without being too TMI, I can vouch for these; they really do work and they offer total peace of mind when it comes to exercising on your period.

Reebok primula 3 pack seamless thong in black neon - ASOS

Because they need to be breathable, soft and ideally not show up under leggings, running underwear is usually made of different, more expensive material than normal underwear. This thong is ideal for running as it doesn’t dig at all and fits seamlessly underneath leggings and shorts.

Anyway, this is a comfortable all-rounder; it ticks all the boxes when it comes to a practical pair of running undies. I love a G-string, primarily because they have that barely-there feel, and this pair is no different as it fits comfortably against the skin and is super soft. This run-specific brand has created a range of products that work well for short runs, long runs and everything in between.

Reebok | ThongAGGIE 3p Ld99 | Women | Blk/Abstr/Aqua | Ace Reebok | ThongAGGIE 3p Ld99 | Women | Blk/Abstr/Aqua | Ace

Kim Kardashian’s Skims brand has come a long way since it launched several years back, and I love the fit of its undies; they’re honestly so soft and smooth against the skin. There’s also a side mesh panel on these briefs for greater airflow, plus the recycled fabrics and Merino Wool ensure that these are even more breathable, keeping you fresh.

Boody says that this G-String has been designed following a seam-free process to ensure less waste, so the sustainability credentials are there too. Available in a multitude of colours and prints, these bikini briefs (AKA, pants) are great for running, lounging, or just general wear. However, if you're wearing unlined running shorts, wearing running underwear can help prevent sweating and offer support and comfort. Sloggi has created a totally seam-free pair of pants that feel so soft, you’ll barely feel them on your skin.