adidas ultraboost 21 grethr grethr grefou 1285487 A classic flip-flop design with

A classic flip-flop design with thin

Updated with thin elastic at the waist so that the tights stay in place during the entire training session

Ribbed crewneck with snap closures on shoulder

This version has been updated with a stocking-like construction that breathes and with wider lacing

A medium-thick technical sock for outdoor activities

adidas ultraboost 21 grethr grethr grefou 1285487 A classic flip-flop design withEnergy was just energy until energy met Ultraboost 21. Prototype after prototype. Innovation after innovation. Testing after testing. Meet us in the hot pursuit of the pinnacle harmonization of weight, cushioning, and responsiveness. Ultraboost 21. Say hello to incredible energy return. Sock like fit Lace closure adidas Primeknit+ upper Textile lining Supportive heel counter Boost midsole