The 120mm PWM fan supplied with the Glacialtech Alaska heatsink spins at 1600-700RPM and draws power from a standard 4-pin motherboard fan header. Six 6mm diameter copper heatpipes rise up through bare aluminum fins which have many 2mm diameter perforations across the surface. The fins have a rolled trough along the front and rear edges as well. Each aluminum fin measures 0.3mm thick and is spaced 1.5mm and 3.5mm apart.

Glacialtech's Alaska heatsink stands 156mm tall, the bottom-most fin being 33mm above the CPU socket for clearance. From the side the 75mm wide fin pattern looks like a honeycomb. The six heatpipes are soldered side by side on the 2mm thick copper base plate and expand outward to form a flattened X-pattern where they pass through the aluminum fins. The base incorporates an 11mm thick aluminum extrusion for clamping and a little extra cooling surface area.

Looking at the Glacialtech Alaska heatsink from the top you can see the perforated aluminum fins more clearly. Fin edges have a saw-tooth pattern to help decrease air flow resistance. The six nickel plated heatpipes intersect the fins in a sort of X-pattern that permits equitable heat conduction to the higher airflow regions of the fins. The nickel plated copper base plate is soldered to the heatpipes, but seemingly a little small at 30x40mm in size.