Hotjak WarmGuard Cap Reviews Consumer Reports To elaborate on the thermal science behind the design, the Hotjak WarmGuard Cap balances convective heat control and conductive insulation through its chosen materials, and the Hotjak WarmGuard Cap's performance can be parsed in those terms. Meanwhile the fleece inner layer of the Hotjak WarmGuard Cap functions as a thermal insulator by creating a layer of still air next to the skin; the Hotjak WarmGuard Cap's fleece traps that air, and trapped air is a poor conductor of heat, so the Hotjak WarmGuard Cap reduces conductive losses as well.
Hotjak WarmGuard Cap Reviews Consumer Reports To elaborate on the thermal science behind the design, the Hotjak WarmGuard Cap balances convective heat control and conductive insulation through its chosen materials, and the Hotjak WarmGuard Cap's performance can be parsed in those terms. Leather, used on the Hotjak WarmGuard Cap exterior, provides a dense, low-permeability barrier that prevents moving air from sweeping across the scalp and carrying away heat — this is critical because convective heat loss, caused by wind moving heat from warm surfaces to cooler air, is a primary reason people feel cold quickly outdoors. Order Now Hotjak WarmGuard Cap Where to Buy