Spark R&D Surge Asym Rip N Flip Highback spark-rd and comfort of the Smartwool

and comfort of the Smartwool Cycle Zero Cushion Crew socks

It moves like a beefed-up hiking boot

The merino wool offers natural thermoregulation and odor resistance

For bike-to-ski missions and multi-sport days

8 and 11 release values

Spark R&D Surge Asym Rip N Flip Highback spark-rd and comfort of the SmartwoolNew for the 22 23 season from Spark is the Asym Rip 'N' Flip Highbacks designed from molds of popular snowboard boots for increased ergonomics and durability. These highbacks have the same great uphill and downhill performance of the traditional Rip 'N' Flips Spark is known for with a few upgrades: an asymetrical shape to match your natural stance, more material at the base for additional durability and a flatter upper section for improved lateral