I've been riding horses for the past 2-3 years and being generously endowed thanks to EVERY WOMAN on both sides of my family, trotting and loping was a problem.  This girls get to bouncing and it creates a huge problem for me since I'm not that good in the saddle yet.  I gave up trying all the usual brands - hated the ones with no hooks in back, hated the ones with no underwire.  Tried one of these.

Let my horse of the chain and tried some fast paced riding on trails the other day... and?

I've bought three more in the past week.

There's no bounce, no jiggle, no wiggle, no wobble, no getting out of sync, no nothing, yet its comfortable - I've worn mine under normal office job clothes and its great for support without squishing or smashing me into a uni-boob.  They're tight at the largest hook set yes, but that's the nature of the beast and in time, bra bands tend to stretch, so I know I have two more sets of hooks on the band for tightness in the future.

I like the racer back hook option for the horseback riding, the regular for day to day wear.  Excellent product, well worth the money and I like that they come in every size imaginable and such lovely colors.