Sony S2 Sports line now extends to MD player with the introduction of the MZ-S1 Net MD Walkman. Following the tradition of the product line, Sony is outfitting the new portable audio player with a steely white, water-resistant casing with brushed black and scorching orange accents. While the MZ-S1’s dashing design might appeal to people leading an active lifestyle, the rest of us might find other feature-rich models more functional.