These shoes will allow for an over-sized boot and are extremely easy to put on once sized appropriately, it literally takes me 45 seconds put on both shoes. The unique construction of this series allow the entire perimeter of the shoe to act similar to a crampon. These provide very good grip on icy and rocky areas such as stream crossings. I weigh 175lbs and when hiking in the finest powder I sank about 10 inches. These shoes are surprisingly light and feel very strong under my weight. I am very pleased with this purchase. I did not use the flotation tails. The terrain I used these shoes on was narrow trail, steep, switchback, under/over blow-downs, stream crossings etc.