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FASTEN is a fashion technology company that has evolved the one-piece with their patented design. The FASTEN one-piece can be opened at the waist via hidden fasteners to make diaper changes and bathroom visits FASTER, EASIER and CLEANER. FASTEN one-pieces stay on the body during these “I’ve gotta go moments,” eliminating the struggle of removing a wet swimsuit or tight bodysuit. FASTEN has created the ONLY swimsuit on the market that can open across the waist, providing the look and coverage of a one-piece with the convenience of a two-piece. FASTEN gives girls (and their parents) another option when purchasing a swimsuit or leotard. Founders Alexis Castellano and Jill Slater created FASTEN to solve a problem they experienced with their own daughters, but have now selling all over the world via fastenswim.com. FASTEN has received glowing reviews from both expert mom bloggers and customers. They have been featured on Buzzfeed, STYLE INSIDER, The HuffPost, Parents.com and Scary Mommy, as well as on popular mom blogs including Cool Mom Picks (who named FASTEN the "smarter one-piece") and Savvy Sassy Moms (who called FASTEN "a mom's dream come true").

Fasten Questions

The Fasten annual revenue was $5 million in 2026.

Fasten is based in Wickatunk, New Jersey.

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