Ben continues his fight to overpower winter and takes on a viewer challenge to build bicycle handlebar warmers. Abby bikes to work in the winter and her hands get very cold, even with mittens, so she asks Ben to create a DIY solution for cyclists like herself. Ben gathers some readily available supplies to hack for the build - motorcycle handlebar warmers, a portable USB charger, and a project box. He builds custom cork handlebar grips, goes over how a step-up regulator works.