The Adidas NMD S1 is a sneaker that builds on the original NMD series by Adidas, which has been popular for its blend of style and comfort. The "S1" stands for "Sneaker Number 1," and it represents an evolution in the NMD line with some key differences: 1. **Design:** The NMD S1 has a more futuristic and chunky design compared to previous NMD models. It features a thicker sole and a more exaggerated, bold look. 2. **Sole Technology:** The sole of the S1 is more substantial and incorporates innovative cushioning technology, offering enhanced comfort. The design often includes large, protruding "pillars" on the outsole, which are both a design element and functional for grip. 3. **Materials:** The upper is usually made from premium materials like Primeknit, which provides a snug, sock-like fit. The construction emphasizes both flexibility and support. 4. **Style:** The NMD S1 has a modern, urban aesthetic that is versatile enough to be worn with casual or streetwear outfits. 5. **Popularity:** Like other NMD models, the S1 has garnered attention not just for its performance features but also for its fashion-forward design, making it popular among sneaker enthusiasts and collectors. Overall, the Adidas NMD S1 is seen as a premium and stylish sneaker that continues the legacy of the NMD line with new innovations.