Best grown-up bra - cushioned straps don't cut into your shoulders.  Sides low enough to not cut into your armpit but wide enough to be supportive.  Cushioned material so people can't tell if you're cold.  Excellent double-stitching at the wire ends, lasts a very long time and many washes before the inevitable poke.  I buy a new color every couple years, and usually only have to replace because I just threw into any open laundry in a hurry or the straps start slipping down frequently.