Sports Bra Fit Problems Explained

1. Armpit Spillage

Most of us will have some, especially once you put on a sports bra, which is designed to hold everything in firmly so if you’re carrying a bit of extra-extra (like most of us!), it has to go somewhere.

A sports bra’s job is support, not fat removal.

So yes — some softness near the armpit is normal. But a lot of bulging or obvious spill usually means the bra doesn’t fit properly.

How to tell a good fit from a bad fit

Normal fit (some softness is normal)

A sports bra usually fits well when:

• the fabric sits smoothly against the body
• there’s no sharp digging at the armhole
• breast tissue is contained (not escaping sideways)
• it feels supportive and comfortable during movement

Softness is fine if it looks even and supported.

Poor fit (excess spill = size or style issue)

A sports bra likely doesn’t fit if:

• there’s a lot of tissue spilling out
• the armhole is cutting in hard
• you feel pinching, rubbing, or restriction
• it gets worse once you move (walk, jog, jump)

This usually means:

• the cup is too small, or
• the armhole/side panel is too low, or
• the style isn’t right for your body shape

Fill out my online Fitting Form if you'd like some size and style recommendations.