Side by side
| Compression | Encapsulation | Combination | |
|---|---|---|---|
| How it works | Flattens both breasts against the chest | Separate shaped cup for each breast | Separate cups plus a compressive layer |
| Looks like | A crop top | An everyday bra in firm fabric | A structured bra with a high neckline |
| Usual sizing | S, M, L | Band and cup | Band and cup |
| Fastening | Often pull-on | Hook and eye | Hook and eye, sometimes with extra closures |
| Generally suits | AA to C; low to medium impact | D and above; any impact | D and above; high impact |
Compression
A compression bra is a tight layer of stretch fabric. By pressing the breasts to the chest wall, it makes them move with the torso.
- Advantages: simple, light, no wires or hardware, comfortable to lie on, usually cheaper.
- Limits: the breasts are held as a single mass, so they can still move together. Support depends on how tight the fabric is. On fuller busts, tissue is pushed up and out and the shape under a top is a single flattened shelf.
Encapsulation
An encapsulation bra has two distinct cups, often moulded or seamed and sometimes underwired. Each breast is surrounded and supported on its own.
- Advantages: controls each breast individually, including side-to-side movement. Fitted in band and cup sizes, so it matches your size closely. Keeps a natural, separated shape.
- Limits: more structure, more seams and hardware, and you need to know your bra size. Usually more expensive.
Combination
Most high-impact bras for larger cups are combinations: structured cups inside, with a firm outer layer, a high neckline or an overband that also compresses. They give the most control and feel the most substantial.
Choosing by cup size and activity
| Cup size | Low impact | Medium impact | High impact |
|---|---|---|---|
| AA to C | Compression | Compression | Compression or combination |
| D to E | Either | Encapsulation | Combination or encapsulation |
| F and above | Encapsulation | Encapsulation or combination | Combination or encapsulation |
These are starting points. Comfort while you are moving is the deciding test, and some people sit outside the pattern.
Things that matter whichever type you choose
- The underband. It does most of the work in every design. It must be firm and stay put when you raise your arms.
- The right size. Neither design works in the wrong size.
- Strap design. Wide straps spread load. Racerback and cross-back styles stop straps slipping, and can press on the neck with a heavier bust.
- Fabric. Wicking fabric and flat seams reduce chafing.
Check any sports bra with the six tests in how a sports bra should fit.
Frequently asked questions
Which is better, encapsulation or compression?
Neither is better in general. Compression suits smaller cups and lower-impact activity. Encapsulation, or a combination of the two, generally suits D cups and above and higher-impact activity.
What is a combination sports bra?
One that does both: separate cups for each breast, with an outer layer or panel that also compresses. It is the usual construction for high-impact bras in larger cup sizes.
Can large busts wear compression sports bras?
For low-impact activity, some people find them fine. For running and jumping, a single compressive layer usually cannot control a fuller bust, and tissue is pushed out at the neckline and sides.
Get a recommendation for your size and activity.
Use the sports bra calculator →