GSM stands for grams per square meter — it’s a measurement of fabric weight and density.
In baby carriers, especially woven wraps, GSM helps indicate how thick, heavy, or breathable the fabric might feel:
Lower GSM (under ~220): thinner, lighter, cooler, easier to tighten — great for newborns or hot weather.
Mid GSM (220–270): versatile, suitable for most ages and seasons.
Higher GSM (270+): thicker, warmer, often more supportive — especially nice for toddlers or heavy babies.
A higher GSM means the fabric weighs more per square meter, but how warm or breathable a wrap feels depends on more than just GSM the weave and fibres matter too.
For example, a double weave often has a higher GSM but can still feel airy and breathable because of how the layers are woven. On the other hand, a tight jacquard or cross twill weave in a higher GSM may feel warmer and less breathable than a lighter version of the same weave. Also, some fibres are naturally heavier but still breathable. For example, silk has a higher density (and often higher GSM), but it’s surprisingly breathable and temperature-regulating. That’s why a silk blend wrap can feel light and cool despite a higher GSM.
So while GSM gives you a rough idea of fabric weight the weave and fiber type really shape how a wrap feels in use.