Shaft Height: Approx. 18'' Tall. Reengineering LaCrosse proven work boot comfort system, we've taken Quad Core technology and redesigned it specifically for hunting boots. For the first time ever, Quad Core 4-layer comfort platform system has been integrated into the 4xBurly that features uncompromising scent free and waterproof protection, now with uncompromising underfoot comfort and support.