I have used the Coats and Clark Poly Embroidery Thread for years, purchased at Joanns when they have their 50% on thread sales. After ten years have all the colors. like the variegated thread by sulky, for specialty work, their thread makes really beautiful flowers and leaves. I personally think the Isacord thread cones are way too big...especially when in embroidery, the more color variety the better.....Poly thread can be bleached and hold their color rayon can not, so if you are going to to doing anything for babies or children only use poly.