4505 slim fit 1/4 zip base layer long sleeve running top in deep navy

Product Insights & Style Tips

A clean, pared-down energy defines this 4505 base layer in deep navy. The crew neck sits neat and the long sleeves stay sleek, while a zip at the neck adds a subtle edge and a touch of ventilation when the pace picks up. The muscle-fit cut keeps the torso crisply defined, moving with you rather than bunching at the seams.

Built for easy layering, the piece hugs the body with a lean, athletic line and accommodates movement without bulk. The zip offers adjustable ventilation and neckline shaping, so it looks this good solo or layered under a jacket or vest. It pairs with tech joggers, denim, or performance tights, becoming a reliable anchor as you shift from workouts to street style.

4505 has built its identity on mileage-ready pieces that feel crisp and uncomplicated. A deep navy base layer like this nods to the brand's lean, athletic code, working as a groundwork layer that still reads as a statement when worn alone with dark denim or under a sharp outer.