Shuriken Pulley System TBT for 12sp Ultegra/DuraAce Overshoes The DeFeet Woolie Boolie is

The DeFeet Woolie Boolie is our cushiest sock

and an aluminum stay for rock-solid attachment to the bars

Woolie Boolie socks with the RWS logo are 70% RWS-certified by CU 885920

Lithium-Ion USB rechargeable battery (Micro-USB cable included)

A great value 100 lumen front light with a long lasting simple to use rear light

Shuriken Pulley System TBT for 12sp Ultegra/DuraAce Overshoes The DeFeet Woolie Boolie isThe Shuriken oversized pulley system was engineered for maximum performance and designed to enhance drivetrain efficiency on any bike. The larger pulley diameter enables the system to rotate at lower RPMs, reducing the chain's articulation angle and subsequently minimizing drivetrain friction. The TBT bearings within the pulleys are filled with specially developed light grease to keep drag low and minimize resistance. The combination of a carbon fiber