I tried a ring sling for the first time yesterday at my breastfeeding group and decided I MUST have one. Little did I know how many options there are! I'm trying to decide between a 100% linen sling or a wrap conversion sling. I currently have a 4 week old and am hoping to use it from now until he's a toddler. I live in Chicago, so it gets very warm in the summer and very cold in the winter. I guess I'm looking for something versatile, durable and long lasting. Which fabric do you prefer and why?