The single-layer sling is light, cool and breathable. Most people prefer the single layer for newborns and smaller babies. Double-layer slings are thicker and heavier. That thickness provides extra support and comfort, especially for carrying larger babies for longer durations of time. Double-layer slings take longer to break in, but are comfortable to wear and last a lifetime once they are. Both our single- and double-layer slings are suitable for babies up to 35lbs. Read more about our them on our fabrics page, or take our shopping quiz here to see which sling is right for you.