Shaft Height: Approx. 7'' Tall. The Onalaska is a revolutionary lightweight pac boot design featuring innovative Ice Shield technology. Convenient zip closure, abrasion resistant leather with lightweight and rugged nylon upper. Moisture wicking comfort collar padding. Ice Shield technology provides insulating warmth with abrasion resistant protection. Layered insulating footbed, thick, cushioning EVA midsole. Trempalo outsole design for athletic performance and superior traction on snow and ice. Ice Shield technology provides insulating warmth with waterproof and abrasion resistant protection.