Casio’s watches are famously tough. Its G-Shock range is armored with enough strength for military use and even its signature F-91W model is famously durable despite its affordable price point.

But the Casio CPP-002 watch might blow them both out of the water, which is surprising given its unassuming toy-like build. The watch doesn’t even wear a normal strap, instead fitted to a spiraling elastic band.

Don’t let the playful look of the CPP-002 fool you, though. This watch can go where most others can’t.

This Casio watch is purpose-built to withstand temperatures of up to 100 degrees Celsius (that’s 212°F or the temperature where water boils), meaning you can wear it to the sauna, as was intended, or the bath or the jacuzzi — the possibilities are (almost) endless!

However, there are stipulations.

Casio recommends no more than 15 minutes at a time to prevent skin burns. Well, you shouldn't stay in the sauna that long, anyways.

The CPP-002 isn’t only one of Casio’s most durable watches (despite only weighing 24.5 grams), it’s also one of the brand’s most elusive. 

After a round of crowdfunding on the Japanese site Makuake, the CPP-002 was released exclusively in Japan last year. Now the watch is returning for ¥16,500 (around $108), though still in very limited numbers and still only in Japan. Truly the rest of the world has yet to catch up to onsen culture.

Highsnobiety has affiliate marketing partnerships, which means we may receive a commission from your purchase. Want to shop the products our editors actually love? Visit the HS Style Guide for recs on all things fashion, footwear, and beauty.