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Our Story - The cold weather shouldn't stop you doing the things you love.

Thermal Theory started with a search for everyday clothing options that offered core warmth and wind protection without looking like they were designed for a polar expedition.

Thermal Theory is based in regional South Australia. We live between two amazing locations; the unique environment of Kangaroo Island and the beautiful Adelaide Hills.

We've developed a clothing range that can take you from the couch, to the beach, to hiking in the hills; all while maximising comfort and warmth.

Our unique dual layer fabric offers a thick outer shell for wind protection and a super soft brushed sherpa inner core for ultimate comfort.