The Shimano SH40 cleat adapters improve how SPD cleats work on the smooth outsoles of most road bike shoes.

They have pontoons that recess your SPD cleats to improve walking stability when off the bike. 

Features

Compatible with road shoes that have For SH51 & SH56 Shoe Plates
Compatible with Shimano SPD cycle pedals only
Help dissipate the loads on carbon or composite soles
Stabilizing Cleat Mounting
Supplied With Hardware
Makes Walking Easier and more comfortable
Helps Protect Soft Floor Surfaces