Superfeet Trailblazer Insole Size:Size F Uses 1 x 275 mAh

Uses 1 x 275 mAh Li-Po battery (Built-In)

Rucksack hip belt can be fastened through hand warmer pocket

single click the switch to cycle Moonlight - Low - Mid - High* Burst Mode: Press and hold the switch for 1

it also features red

Superfeet Trailblazer Insole Size:Size F Uses 1 x 275 mAhGreat for Hiking & Outdoor Footwear Superfeet TRAILBLAZER Comfort insoles stabilize your feet on uneven ground and enhance comfort, even on the roughest terrain. Made to replace the sockliner in roomy to moderate fitting athletic and outdoor footwear. Trim to fit your shoe size. A. DEEP HEEL CUP Helps prevent heel slip and toes from hitting the front of the boot B. MEDIUM TO HIGH ARCH SUPERFEET SHAPE Medium to high arch support in an orthotic shape