Hi, we're Tiina (Founder) & Yvi (Co-owner) – the faces and hearts behind MAIN Design . Two women who love surfing, sun, and the sea – but above all, women who want to feel good in their own skin. 🩵

MAIN Design began as a small idea on the coast: What if swimwear could finally be the way we want to feel? Free. Strong. Beautiful – without compromising on sustainability and functionality.


Tiina & Yvi – Founders of MAIN Design

💙 What drives us

We believe that fashion is more than a look – it's a feeling. MAIN Design stands for confidence, mindfulness, and true body diversity . Our surf bikinis and swimsuits are designed to accompany you through every wave – physically and emotionally.

We design for women who know that beauty lies in movement. For mothers, surfers, free spirits – real women, real shapes, real stories.

A woman smiles with three barefoot children, all wearing matching Main Design Shoreline Breeze poncho outfits. Their cozy, one-size-fits-all clothing complements the simple wooden floor and plain white wall behind them.
Real women. Real Summers. Real Confidence.

🌺 Our Philosophy

MAIN Design is about more than just clothes. It's about the feeling of celebrating yourself – at any age, any size, any stage of life. Our collections are created in small series, with attention to detail and respect for our planet.

We believe in quality over quantity, in responsibility over trends – and that sustainability is not perfect, but personal.

Shop our Collection →


MAIN Design – by women, for women who love the sea and want to make the world a little more beautiful.

Tiina Kosonen