The WaveCel hard hat is available in two designs, the WaveCel T2+ Max ($189), a full-brim vented hard hat with top and rear vents, and the WaveCel T2+ Pro ($169), which is non-vented.

It's a hat with embedded solar panels.On the underside of the brim, there’s a little plastic box with an LED light showing you the hat is generating a charge. Pull back the attached rubber tabs ...