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Comparing Period Underwear: Knix VS Thinx

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December 4, 2017

I LOVE talking about all things period – and I’ve been pretty open about my own period routine. If you’ve been keeping up with the blog, you know that I switched to a menstrual cup over 2 years ago and have been loving it. But lately, there’s been tons of talk about period underwear. I’m part of a bunch of different women’s group and there’s always questions popping up about if period underwear are worth it, which brand to get, etc. 

Because I want to continue minimizing my carbon footprint, be part of the conversation, and help women make a well-informed purchase – I bought a pair of period underwear from Knix and a pair from Thinx. In this post, I’m comparing the construction and price. My next period isn’t for a couple of weeks, so I’ll be updating this post to focus on the performance of both pairs. 

knix underwear review, thinx underwear review

Knix Review

Cost: $43 (with tax & shipping)
Construction: Seamless, absorbant gusset
Performance: TBD

Knix is a Toronto-based company, that sells bras, underwear and recently loungewear. I have purchased one of their bras in the past, as well as regular underwear. Their regular underwear is made from nylon and Lycra and is seamless.

Their leakproof line is designed for periods and urinary incontinence (PS. if you do leak while you run/jump/laugh, I would recommend seeing a pelvic floor physiotherapist). The bikini underwear can hold up to 2 tampons-worth of fluid, which is roughly 10mL (or 2 tsp), although they have other styles (like thongs) that hold less. 

Their leakproof underwear is designed very similarly to their regular line – both are seamless, the body is made from nylon and Lycra, the only difference is that the leakproof pair has a lined crotch (also known as a gusset). The gusset is 86% cotton. There isn’t any extra support in the front or back area. While I probably won’t wear these overnight on my heavier days (when paired with a menstrual cup), I’m excited to wear them during the day on my lighter days as a replacement for a liner. 

Lastly, taking care of the Knix seems easy, machine wash in cold water and hang to dry! 

Thinx Review

Cost: $53 (with shipping & converted to $CAD)
Construction: Not seamless, fully lined, extra layer from front of the gusset extending to the back
Performance: TBD

Thinx is an American-based company that only sells period-proof underwear – although they do have a sister company called Icon designed for women who experience urinary incontinence. Thinx is moisture-wicking, anti-microbial, absorbent and leakproof. My pair is made with breathable PUL fabric, and the inside layer is 95% cotton (which is great for those who suffer from chronic vaginal infections). I purchased the scarlet hiphuggers, that are designed to hold 2 tampons worth of fluid. Like Knix, they have various styles (like boy shorts) that hold different amounts of liquid. 

I was so pleased when I opened these because they are fully lined (back and front!)! They look and feel completely different than Knix, they would be great for those heavy overnights (as a back up to my menstrual cup). While these are slightly more expensive than a pair of Knix, it feels like you’re getting a more functional product (as they can be used during the day and night) – especially if you’re like me and want to stop relying on pads completely. That said, I haven’t tested them out yet!

Taking care of the Thinx seems incredibly easy – after you’re done using them you simply pre-wash them by hand, machine wash in cold water and hang to dry.

knix underwear review, thinx underwear review

Final Thoughts

Now that I’ve compared how they look, feel and cost – I still need to put their performance to the test! During my next cycle I’m going to be rocking the Knix during the day and the Thinx at night. 

You can check out Knix’s leakproof line here, and if you want to save $10 on a pair Thinx, use this link!

Lastly, if you love learning about periods and want to keep in the flow, sign up for my monthly newsletter called The Flow for great and informative content like this! And you’ll also get a free plan while you’re at it!

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