Review: Esker Approach Insoles Esker Insoles takes a natural approach to orthotics with their Approach Insoles. Canadian wool felt, linen canvas, and natural rubber combined with a supportive orthotic shape make the Esker Approach Insoles a great way to keep your feet happy on the hills.  Overview Material: Wool Felt, Linen Canvas, and Natural Rubber Weight: 168 grams for a pair of size 44 Country … Continue reading Review: Esker Approach Insoles