Most stretchy wraps are 100% cotton, but the JPMBB wrap is 95% cotton and 5% Spandex. This makes the cotton fiber (which isn't naturally flexible) stretch and avoids sagging, even after an intensive use or when wearing a heavy kid.
Most wraps «stretch» only because they're rib knit (the fabric stretches like an accordion) and not because of the fibers they're made of. Those fabrics have no «memory» and cannot stretch vertically, horizontally and diagonally.
The fabric is knit only and exclusively for JPMBB. Although there are many other stretchy wraps, JPMBB doesn't compare with any of them.
The JPMBB wrap is the only one that stretches in every direction: vertically, horizontally and diagonally. This makes Pocket Wrap Cross Carry more flexible than with other fabrics. Even if there are several layers of fabric in this carry, Baby is held evenly with a harmonious tension, while the lower layers of fabric keep their stretch.
Woven, 100% cotton wraps (cross twill) can only stretch a bit diagonally. They are soft and firm at the same time, that's optimum for Baby's and wrapper's comfort in Kangaroo Carries, where there's only one layer of fabric on Baby's back.
Knit, 100% cotton wraps that only stretch lengthwise aren't ideal for Cradle Carries that need the fabric to stretch widthwise. This uneven stretch, and the fact that they are often quite narrow, makes them harder to use with a bigger Baby.
The fact that the stretch comes from the weaving and not the fiber can lead to sagging when the wrap is used frequently with a heavier child.
The JPMBB wrap is very dense and can be used to wear children from birth up to 14kg, even on long periods of time. For big, tall children, we recommend back carries.
Care instructions: machine wash cold, air dry, hot iron, no bleach. No fabric likes tumble drying: treat your wrap as if it were your favorite shirt.
