Sierra says: The Synapse is an aggressive versatile boot for the intermediate to advanced all-mountain freerider. This boot is as stiff as a boot can be while staying very comfortable. The Bio Custom Fit Liner and Ortholite Footbed offer great cushion, but the outer shell is stiff for great response. The speed lacing system allows for quick and easy lace up for increased time on the mountain. Als...

Sierra says: The Synapse is an aggressive versatile boot for the intermediate to advanced all-mountain freerider. This boot is as stiff as a boot can be while staying very comfortable. The Bio Custom Fit Liner and Ortholite Footbed offer great cushion, but the outer shell is stiff for great response. The speed lacing system allows for quick and easy lace up for increased time on the mountain. Als...