I bought 絲棉被 for my child in 裕華 several years ago. It is really warm and light. I myself used 羽絨被 for more than 12 years. But sometimes when I use his 絲棉被, the feeling is really good as it is very soft.
I have tried 羽絨被 before, now I have bought a 100% 蠶絲被 (also Casablanca), it is really the best for my baby! For me, I will not buy 羽絨被 if it is only 50%羽絨, it is not good enough.