The phrase "soft contours" refers to gentle, smooth lines or shapes. It means that something doesn't have sharp edges or angles, but is instead rounded or curvy. Full definition
I prefer a more soft contour but it's also great for a more defined look if you prefer that. (nyxcosmetics.com)
Shades include: Light Brown (for soft contouring), Medium Brown (for crease and soft lining), and Dark Brown (for lining and more dramatic definition). (thefashionablehousewife.com)
The BabyBjörn Potty Chair is designed with soft contours, a high backrest, and comfortable armrests to give toddlers a pleasant toilet - training experience. (babycenter.com)