Atom Thong in Black

Our orders are delivered within 2-5 business days and cost €3.99 for orders within the Peninsula. We offer free shipping on orders over €50. 

Free shipping to the Balearic Islands and Peninsular Portugal on orders over €65.

For more information, check out our Shipping Policy.

You have 14 calendar days to return your order or exchange sizes if you're not satisfied. Size exchanges are completely free on your first purchase (Mainland Spain). Find more information in our Refund Policy. Refund Policy.

⚠️ At Bum, we do not follow a standard sizing system as our tops are designed for women with smaller chests. Therefore, if in doubt, we recommend sizing up.

The atom bikini is designed to cover the essentials and thanks to its ties it adapts to different body types.

You can also use our size guide to estimate what size will fit you best, keeping in mind that bikinis run small.

If you have any questions, feel free to send us a direct message or an email.

The Atom bikinis, handmade in Spain, are inspired by the atom, the smallest and most basic particle of matter. They are designed to cover as little skin as possible, minimize tan lines and enhance the female body.

The top is multi-position and is made up of two triangles, and the thong, also with ties on the sides, can be worn low or high-raise. The back part is made to make you feel comfortable: it doesn't slip and slide, it doesn't get baggy, and it makes your ass look perfectly round.

Our fabrics are certified by the OEKO-TEX® 100 standard as a guarantee of quality, and have UPF 50+ sun protection, which means they block more than 98% of UVA and UVB rays, to take care of your skin during the day.

In addition, we only use high-quality Italian fabrics made with ECONYL®. Econyl is a nylon recovered from plastic waste (including fishing nets, carpeted floors and industrial plastics salvaged from around the world). In this way we are transforming waste into beautiful bikinis that allow us to give an actual second chance to the resources that the planet has to offer.

FABRIC PROPERTIES:

Ⓧ Pill-resistant

☼ UV protection

♺ Recycled fibers

⚠ Ultra chlorine resistant

⍉ Resistant to oils and creams

✦ High coverage

Our bikinis are made with high-quality materials and are designed to withstand the test of time, but it's up to you to follow these tips to make them last even longer.

• Rinse after each use: Salt and chlorine deteriorate swimsuit fabric, which is why it's important to remove their remains by rinsing the bikini or leaving it to soak for a while every time you use it.
• Handwash: If you want to wash it more thoroughly, use neutral soap and lukewarm water. Rub it gently so it doesn't stretch, and rinse with plenty of water.
• When drying: Always put it to dry in the shade, as the sun wears out and fades the fabric.