If you've been researching period underwear for your daughter, you've probably come across Thinx Teens period underwear (sometimes called Thinx BTWN). It's a well known name, and a lot of Australian mums land on our site while comparing the two. So let's make that comparison genuinely useful.

The short version

Thinx Teens is the teen specific line from the US brand Thinx, aimed at younger, lighter flow wearers. Eco Period's teen range covers a wider set of situations, from her very first period through to school days, swimming and a full cycle rotation, all from an Australian owned business. If you want a complete, purpose built system for the teen years rather than a single product line, Eco Period is likely the easier path. If you're already comparing US brands generally, Thinx Teens is a reasonable option too.

At a glance

What she's actually getting

Thinx Teens is built around everyday teen underwear with built in absorbency, generally suited to lighter days. Eco Period's teen range is broader by design. Our Orgaknix Teen Boyleg and Brief styles are organic cotton next to skin, built for moderate to super absorbency, so they can carry her through heavier days as well as light ones. On top of the everyday styles, we've built specific products for specific moments, a First Period Kit for the very first time, a Teen School Confidence Pack for reliable school days, and a Teen Complete Cycle Pack that pulls together a full week's rotation of underwear and one swimwear piece in a single order.

That's the key difference. Thinx Teens gives you underwear. Eco Period gives you underwear plus the moment specific products that make the teen years easier to navigate, without you having to piece it together yourself.

Price and what you're paying for

Eco Period's teen styles start at $22 for a single pair, with bundles priced to reduce the per pair cost, $99 for the Teen School Confidence Pack (4 pairs plus pads and a wet bag), and $179 for the Teen Complete Cycle Pack (10 pieces including one swimwear item). Because we're Australian owned, there's no currency conversion or import markup on top of the sticker price.

Thinx Teens is priced in USD as its base currency, so Australian shoppers are typically paying a landed price that includes currency conversion and, depending on how you order, shipping and duties. Worth checking the true AUD total before comparing headline prices.

Swimming, does either brand cover it?

This is worth calling out directly because it's an easy thing to overlook. Eco Period has a dedicated teen period swimwear range, the Teen Diamond Back One Piece ($79, recycled nylon, several colours) and the Teen Racerback Pro ($82, chlorine resistant polyamide, built for regular swimmers). If she's swimming at school or training with a squad, this matters. Thinx's swim range is more limited, so if swimming is a regular part of her week, that's a genuine point in Eco Period's favour.

Who this suits

Eco Period's teen range tends to suit families who want everything handled in one place, first period through to school days and swimming, from a brand they can reach an actual person at. It also suits mums who specifically want organic cotton next to her skin.

Thinx Teens may suit families who are already comfortable with the broader Thinx brand, or who are shopping the US market where currency conversion isn't a factor.

A note on how we talk about this with her

Whichever brand you land on, the switch to reusable period underwear works best when it's framed calmly, this is just what she'll wear now, not a big production. If this is her first time hearing about period underwear at all, our First Period Kit is built specifically to introduce the idea gently, with everything explained in a way that's reassuring rather than clinical.

Making the decision

If you want one brand that covers her first period, school days, a full cycle and swimming, start with Eco Period's teen range, the First Period Kit is the natural entry point if this is new territory for her. If you're comparing broadly across US brands and want to see what else is out there, it's worth looking at Thinx Teens alongside it, just factor in the real AUD cost before you decide.