Tracksmith Brighton Running Base Layer

Seams can be a real problem for runners, leading to chafing, discomfort, and ultimately shorter sessions. The Brighton base layer from Tracksmith is built with seamless construction to avoid such issues. Its engineered 16.5-micron blend is 52% wool, 28% nylon, and 20% polyester, with a mesh that's more open around the core for free movement and a closed knit on the sleeves for more warmth in the extremities. While it was designed as a base layer for wear under a mid-layer or jacket, it's not too tight to wear on its own in more casual settings.

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