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Kiprun and Smoon Introduce Running Shorts With Built-In Period Protection

May 19, 2026
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Kiprun and Smoon’s new Run 900 shorts blend lightweight race-ready design with built-in period protection, letting runners train and compete comfortably with a three-layer absorbent brief that helps prevent leaks for up to 12 hours.

​Kiprun, the running brand owned by Decathlon, has introduced a new pair of running shorts designed specifically for women who train and race during their menstrual cycle.

​The product was developed in collaboration with French menstrual technology company Smoon and features a built-in absorbent brief.

(Credit: Kiprun)

​The shorts, called Run 900, combine standard running apparel with integrated period protection. Instead of wearing separate products, runners can use the shorts as a single piece of gear during training or competition.

​Inside the shorts is a three-layer brief designed to absorb menstrual flow and prevent leaks.

​The top layer pulls moisture away from the skin to keep it dry. The middle layer absorbs liquid, with a capacity equivalent to about two tampons. A waterproof outer layer helps prevent leaks and control odor.

According to the companies, the protection can last up to 12 hours.

​The outer fabric is based on Kiprun’s existing Run 900 Light running shorts.

​The garment weighs about 111 grams in a medium size and includes practical features such as a zippered pocket on the back, a small internal key pocket, and seams designed to reduce chafing during long runs. The materials used are OEKO-TEX certified and tested for skin safety.

​The collaboration between Decathlon and Smoon took five years to develop. Smoon has previously produced menstrual swimwear and other products designed for active use.

​The Run 900 shorts are priced at €49.99 and are expected to be used for both training and race day.

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