Nylon base layers stand out for their smooth, almost silk-like feel and exceptional durability. If you're layering under tight-fitting ski pants or a snug race suit, nylon's slick surface lets your outerwear glide easily without bunching or catching—something woolier fabrics can struggle with.
They're also a great call if you're tough on your gear. Nylon resists abrasion and holds up well to repeated washings, making it a solid choice for frequent riders who don't want to baby their base layers.
The main trade-off is drying speed. While nylon wicks moisture well, it dries a bit slower than polyester grid fabrics, so if you're a heavy sweater or doing high-output backcountry tours, polyester might be the better pick. But for resort skiing where you want a smooth, durable layer that slides easily under your kit, nylon is hard to beat.