Key takeaways
- Polartec Power Grid is a lightweight grid-patterned fleece for active layers.
- The raised grid insulates while the recessed channels vent moisture and air.
- It balances warmth, breathability, and low weight — ideal for high-output cold-weather use.
- It's famously used in grid-fleece pieces like the Patagonia R1.
Polartec brand fleece.
What Polartec Power Grid is
Polartec Power Grid is a lightweight grid-patterned fleece from Polartec, with a distinctive waffle grid on its inner face. It’s engineered to balance warmth, breathability, and low weight, making it a favorite fabric for active base and mid layers.
How the grid works
The grid is made of raised bumps and recessed channels. The raised areas trap warm air against your body for insulation, while the channels let moisture move away and air flow through — boosting breathability and cutting weight. The payoff is more warmth-to-breathability than a solid fleece of similar weight.
A ski tourer wears a Power Grid layer on the climb — the grid breathes enough that they don’t overheat and soak out, yet traps enough warm air to stay comfortable — exactly the balance that solid fleece can’t match during stop-and-go effort.
Where it’s used
Power Grid shines in active base layers and breathable mid-layers for high-output cold-weather pursuits. It’s the fabric behind well-known grid-fleece garments like the Patagonia R1.
The bottom line
Polartec Power Grid is the grid-fleece that powers many a favorite active layer: its waffle structure traps warmth in the bumps while venting moisture and air through the channels, delivering exceptional warmth-to-breathability at low weight. Ideal for high-output cold-weather use, it's the fabric behind cult pieces like the Patagonia R1.
Frequently asked questions
What is Polartec Power Grid?
Polartec Power Grid is a lightweight fleece fabric from Polartec with a grid or waffle pattern on its inner surface. It's designed to provide warmth and breathability at low weight, making it a popular choice for active base layers and mid-layers used in cold-weather aerobic activities.
How does the grid pattern work?
The grid consists of raised areas (bumps) and recessed channels. The raised areas trap warm air against your body for insulation, while the recessed channels create space for moisture to move away and for air to flow — boosting breathability and reducing weight. The result is more warmth-to-breathability than a solid fleece of similar weight.
Where is Polartec Power Grid used?
It's used in active base layers and breathable mid-layers, prized for high-output, stop-and-go cold-weather activities like ski touring, climbing, and winter hiking where you need warmth without overheating. It's the fabric behind well-known grid-fleece garments such as the Patagonia R1.
Sources
- Polartec fabric technologies — Polartec
- Fleece & layering — The Mountaineers