Which is better for wearing under leggings or gym clothes?

The Thirdlove. Its seamless construction and tagless label are built to disappear under tight fabric, and shoppers call it great for the gym. The Subset is seamed cotton, so edges can show.

Which one is better for sensitive skin?

The Subset. It is 95% GOTS-certified organic cotton with only 5% elastane and no tagless-label adhesive. The Thirdlove blend is 70% cotton with 24% nylon and 6% spandex.

Is the Subset worth five times the price per pair?

If organic certification and a high-cotton fabric matter to you, yes. If you mainly want an invisible everyday thong, the Thirdlove 2-pack at $8.98 covers that for far less.

The Thirdlove's spandex blend resists stretching out and is machine washable in a garment bag. The Subset's high cotton content is soft but can wear faster with frequent washing. Neither brand publishes a durability guarantee.

Do both run true to size?

The Thirdlove is listed as true to size, but shoppers report it runs small, so consider sizing up. The Subset comes in 2XS-3XL with free returns and exchanges if the fit is off.

Which has more back coverage?

Neither has much. The Subset has no back coverage and the Thirdlove has minimal rear coverage, so both are true thongs.

Organic Cotton Low-Rise Thong in Carbon vs Seamless Stretch Cotton Thong

Buy the Subset thong if you want certified organic cotton and a barely-there low-rise fit; buy the Thirdlove two-pack if you want seamless edges under tight clothes at a lower cost per pair. On November 3, 2026 the Subset is $20.00 at Subset for one thong, while the Thirdlove pack is $8.98 at Amazon for two, about $4.49 a pair. The Subset has far more ratings (36,076 vs 609), but both sit at 4.8 out of 5.

Today the Seamless Stretch Cotton Thong costs $11.02 less at its best price.

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