Two baby blankets can look remarkably similar online — both described as “satin-trimmed,” both soft, and both finished with a smooth, lustrous border. But “satin” does not tell you what that border is actually made from. It may be silk, polyester, acetate, rayon, or a blend. The difference is in the fiber. Here is how to understand the label — and how to tell real silk from synthetic satin.
The quick answer
Silk is a fiber. Satin is a weave. That distinction explains much of the confusion. Silk is a natural protein fiber, while satin describes a weaving technique that creates a smooth, lustrous surface. Satin can be woven from silk, polyester, acetate, rayon, or other fibers. That is why the word “satin” alone does not tell you what a blanket’s trim is actually made from. To know what you are buying, look for the fiber content on the label or product description.
What real silk charmeuse is
Silk charmeuse is a fabric woven from silk with a smooth, lustrous front and a softer matte back. Its weight is measured in momme (pronounced “mummy”), a traditional measure of silk weight; a higher momme generally indicates a denser, more substantial fabric.
Robbie Adrian uses 18.5 momme 100% silk charmeuse, chosen for its balance of softness, drape, and substance. As a natural protein fiber, silk has a smooth hand and a distinctive natural luster that synthetic satin is designed to imitate.
What “satin” usually is
Satin describes a weave, not a fiber. A satin finish can be made from silk, polyester, acetate, rayon, or a blend of fibers. On many baby blankets, the smooth, shiny trim is made from synthetic fibers rather than silk.
There is nothing inherently wrong with synthetic satin — it simply is not the same material as silk. The most reliable way to know what you are buying is to look beyond the word “satin” and check the fiber content on the product label or description.
Why it matters for a baby
The trim is one of the most tactile parts of a blanket — the edge little hands may hold, rub, and return to again and again. That makes the feel and quality of the border especially noticeable.
Real silk charmeuse brings a smooth, soft hand and natural luster to that edge. Over time, it becomes part of the familiar feel of a well-loved blanket — one more reason the material at the border matters.
How to tell the difference
• Read the fiber, not the finish. Look for “100% silk” or “silk charmeuse,” not just “satin.” Satin describes a weave, not a fiber. If a listing only says “satin” and does not identify the fiber, it does not tell you what the trim is made from.
• Look for a momme weight. Momme is a traditional measure of silk weight. Quality silk products often list it because it describes the density of the fabric.
• Feel the difference. Real silk has a distinctive smooth hand, natural drape, and soft luster that synthetic fabrics are designed to imitate.
• Consider the price. Real silk charmeuse requires a more valuable fiber and careful craftsmanship, which is reflected in the final product price.
What we use, and why we say so plainly
Every Robbie Adrian blanket is trimmed in real 100% silk charmeuse at 18.5 momme, on a body of organic cotton, knit and hand-sewn in the USA. We name the fiber and the momme because we’d rather you know exactly what you’re buying than take “satin” on faith. If you’d like to see the full breakdown of our materials, our Materials & Standards page lays out every fiber and where it comes from.