Today, if you’re a woman who wants to congeal - er, conceal - tummy rolls, lumpy skin or flabby flesh, you go ‘‘Slim Cognito,’’ use a ‘‘Higher Power,’’ or play ‘‘Hide & Sleek.’’

With fun names, celebrity endorsements and one-word company recognition, Spanx has become the Oprah (who swears by ‘em) of the body-shaping world.

When the Spanx brand first hit the market eight years ago, it began to change the way modern women felt about their undergarments. In short: Minimalist underwear is out. Body-gripping girdle-like structures are in. Even women who slid into size 2’s and 4’s started wearing Spanx to help smooth, shape and lift everything underneath.

There are now more than 100 Spanx products (and many Spanx-like products) on the market, each designed to suck in, tuck in or hoist up your flesh in some unique way.

Why the Spanx revolution? Because it makes you look good. Think about it: no panty lines, limited jiggle.

But trying to choose just the right garment among the dizzying array of Spanx choices available can be confusing and frustrating. And Spanx isn’t cheap.

We decided it was time for someone to decode the mysteries of multiple Spanx. We asked four women to try three bestselling types of Spanx for a month and tell us what they thought. The four women came in various shapes and sizes, and ranged in age from 20-something to the 20-something’s mother.

Here, the results of our investigation.

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Footless Spanx, medium control, $20

What it looks like: This looks like a traditional pair of hose, except they’re cut off just below the knee.

What to wear it with: Pants (and very long skirts)

The good:

‘‘Everyone at work thought I had lost weight.’’

‘‘I was able to wear them with open-toed shoes and slacks.’’

‘‘Fairly comfortable.’’

The bad:

‘‘Because they go far down on the leg (and I’m short), I couldn’t wear them with any of my skirts or dresses.’’

‘‘Itchy like hose.’’

‘‘Makes me feel fatter when I wear it with pants because it’s an extra layer of clothing.’’

‘‘I felt like it gave me a uni-butt when I wore jeans.’’

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Higher Power Spanx, $38

What it looks like: This starts right under the bustline and covers the entire midriff, ending in something that what looks like bike shorts. Crotch is open.

What to wear it with: Skirts, dresses, even pants (but be sure you have on a long top so people won’t see your Spanx; see tips box).

The good:

‘‘Kept me warm in my cold office!’’

‘‘Made me feel more confident in skirts made of thin fabrics.’’

‘‘Tight and a bit of a workout to pull all the way up (I guess that’s why this one comes with a hole in the crotch), but not too tight.’’

The bad:

‘‘Kept slipping down during the day. By the end of the day, the top band would be around my waist.’’

‘‘They help you look good when you’re dressed, but they’re not sexy undergarments!’’

‘‘I feel fat putting them on because they’re tight!’’

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Slim Cognito Seamless Mid-Thigh Bodysuit, $68

What it looks like: Similar shape to the Higher Power Spanx, but this one has a heavier material that holds you in that much tighter. Also made of a slicker material, which keeps clothes draping softly.

What to wear it with: Skirts, dresses.

The good:

‘‘Kept me very warm on cold days.’’

‘‘Made my bum look like it was in much better shape.’’

‘‘My husband said, ‘Why don’t you wear that dress more often?’ It’s one I wear all the time, but obviously, I look dramatically better in it with Spanx!’’

The bad:

‘‘This was so slick that when I wore a skirt, it would slide around my waist and sometimes I’d look down and see my skirt was almost backward.’’

‘‘I really couldn’t breathe comfortably when I had this one in place.’’

‘‘The shorts are long enough on me that if I crossed my legs and was wearing a knee-length dress, someone might see the edge of them.’’

‘‘I rarely got up to walk around because they felt so constricting.’’

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5 TIPS FOR WEARING SPANX ... COMFORTABLY

1. Never, ever put them in the dryer. (And, take it from us: Don’t let a spouse/boyfriend/partner/housekeeper put them in a dryer, no matter how helpful they’re trying to be.) Unless you want to feel like you’re stuffing sausage into casing the next morning, wash Spanx on the gentle setting in cold water, and let them air- dry.

2. In dry winter air, Spanx will attract static electricity, like pantyhose. Keep Static Guard or dryer sheets handy to avoid having your legs/thighs/your derriere cling to skirts and dresses.

3. Wearing Spanx with separates is tricky: If they sit higher than the waistline on your pants or skirt - and your top isn’t tucked in - the undergarment will show each time you bend over, stretch, etc. Think about your outfit and your activities for the day before you pull on a Spanx.

4. Wearing a Spanx body shaper with tights is also tricky: If you must wear both, wear the Spanx over the tights. When we wore tights on the outside, we found that they ‘‘crawled’’ down the Spanx during the day. One caveat: If you’re wearing a short skirt, wear the Spanx under the tights to avoid ‘‘exposing’’ the undergarment when you sit down, cross your legs, etc.