does anyone have a suggestion for a good sling/carrier for summer? i currently use a sleepywrap which is great now but far to warm for the hot weather. DS will be around 6 months in summer so i was thinking an ergo, how breathable are they? anyone have the ergo sport? also need something that doesn't look to girly (or hubby will refuse to wear it!) and can be adjusted for size easily as i'm 5'2 and DH is 6'6.