What is Fabric GSM?
Simply put, Grams per Square Meter (GSM) is the density of any given piece of fabric. This mysterious number is worked out using a formula which takes into account the physical weight of the fabric and its surface area. This means that GSM, while an accurate indicator of the actual weight of the fabric, is not always a good indicator of the thickness - this is a very common misconception. For an Oscha Sling, the GSM is likely to be between 180 and 330.
What does GSM tell me?
GSM tells you the physical weight of your sling and this gives you a few hints about it's properties. Remember, a heavy fabric doesn't always translate into a thick wrap.
Low (below 230gsm)
A low GSM wrap will usually be fairly thin in hand, making them beginner friendly and perfect for warmer climates. Less fabric density means less ‘cush’, so you may need to wrap more carefully or use multiple pass carries for bigger kids.
These will usually be good all rounders - offering support and gentle cush, making them suitable for all ages. These wraps are generally easy to wrap with and break-in, making them a fine starting place for beginners.
High (above 280gsm)
A high GSM wrap is likely to have a good amount cush for the shoulders and will generally offer a lot of support for bigger kids. While a high GSM wrap may be thick in hand, this should not be assumed (see "Weight not Thickness").
Weight not Thickness
A low GSM wrap will almost always feel fairly thin however medium and high GSM wraps can also feel thin in hand and may wrap more like a lower GSM sling. This is down to the yarn type and weave structure
A heavy yarn, such as pure bamboo, woven with a more open structure (i.e. with bigger loops of yarn in the weave) could have a fairly high GSM yet can be wonderfully malleable, and even feel thin to the touch. Orion Cay has a GSM of 291 due to the weight of the Tencel yarn, yet the more open weave structure means it maintains the qualities of a lower GSM wrap.
What does Cush mean?
When a sling is described as ‘cushy’ there is more cushioning or padding on your shoulders and around your waist. It can also be an indication of a little ‘bounce’ in the wrap. Sea Island Cotton is an extremely cushy yarn, a long staple cotton this yarn is durable & strong while having a lot of softness on the shoulders.