Materials are just cotton and elastane in a comfortable rib knit. Color is 'soot', which is black. Super soft and stretchy. Size small is size 4-6. Favorite brands in my closet: Doen, Spell & the Gypsy Collective, Misha & Puff, Paloma Wool, Ozma of California, Ganni, Rudy Jude, Reformation, Free People, Christy Dawn, Le Bon Shoppe, CP Shades, Hunza G