Adidas UltraBoost 21 Men's Running Shoe - Crew Navy/Crew Navy/Core Black Size:9 UK Stretch fit panels for closer

Stretch fit panels for closer comfortable fit

There are mesh inserts behind the knee for ventilation to prevent you from overheating and flatlock seams help to stop chafing

Wrist-based heart rate and Pulse Ox sensors

It’s a propulsive ride quality that’s unique to Saucony—feeling instantly responsive and natural at the same time

Rolling in speed- The SPEEDROLL an always-forward geometry

Adidas UltraBoost 21 Men's Running Shoe - Crew Navy/Crew Navy/Core Black Size:9 UK Stretch fit panels for closerThe Adidas UltraBoost 21 Men's Running Shoe is the latest in a long line to use boost technology. With no EVA, the midsole is entirely constructed from boost, giving you the ultimate in cushioning and energy return. The new Torsion System provides a 15% increase in forefoot bending stiffness for a much more responsive run. The shoe is made with Primeblue, a high performance recycled material made in part with Parley Ocean Plastic. 50% of the upper is