The sports bra: Your No. 1 supporter By Vicky Hallett Special to The Washington Post Tuesday, February 15, 2011; 9:53 AM Everyone has a pair of feet, but women have an additional pair of something to worry about while exercising. And they're every bit as tricky to fit, control and protect, which is why bras are beginning to rival shoes as the most technical of all sporting apparel. When the Jogbra was born in 1977, two jockstraps stitched together were a revelation. These days, the science that goes into corralling women's chests is much more extensive, with garments designed to smush in and hold up while wicking moisture, feeling comfortable and - hopefully - looking good. Big improvements The best news is for well-endowed women. More designers have jumped into the market with gravity-fighting creations, including Athleta, which launched its Signature Sports Bra line in January. The Va Va Sport Bra Top ($54) runs up to size 38DD and is the Gap Inc. brand's No. 1 seller. And good luck trying to track down Lululemon's newest bra, the Bust Stops Here ($58), which promises maximum support and coverage. It's sold out online. Put to the test Most bras address vertical movement but fail to control the breasts when they shift in other directions. "Different types of activity really require quite different support," says Joanna Scurr, head of the Research Group in Breast Health at the University of Portsmouth in Britain. In tennis, there's a lot of upper body rotation, which leads to side-to-side breast movement. In basketball, it's more vertical. Scurr's research into the effects of breast support on athletic performance has led to the sport-specific line of bras ($68 each at www.figleaves.com) from Shock Absorber. The Run Bra zeros in on figure-8 movement, the Ball Bra has extra support at the top to control up-down bounce, and the Racket Bra is constructed in an M-shape to prevent too much lateral swing. Focus on fit Just as running stores have systems for fitting shoes, similar strategies are getting more common for sports bras. Moving Comfort, a leading brand that was founded in the District (but is now based in the other Washington), has made a huge push for proper sizing. Last month it distributed a step-by-step guide to 600 retailers nationwide, including Fit3 in Tysons Corner. The guide includes a DialedFit Wheel to match measurements with bra size and a list of troubleshooting suggestions. (Uneven breasts? Fit to the larger one, then adjust the other strap and add a removable cup to the smaller one.) Get sized Local chain Potomac River Running hosts its next Bra Fitting Night with an expert from Moving Comfort on Thursday from 7:30 to 9 p.m. at the Falls Church store (7516 Leesburg Pike). Space is limited; register at www.potomacriverrunning.com. 1) Do your chosen activity when you're trying on a bra: run, jump, do downward-facing dog. "Try lying on your back," advises exercise scientist LaJean Lawson, who tests bras for Champion. You don't want anything poking you. 2) Check out the side view. If your breasts are popping out, the cups are too small. If the fabric is wrinkling, they're too big. The band should stay level, and there should be no itchy or hot spots. 3) Repeat this process for your bras at home. The general rule: A sports bra should never celebrate a birthday, though that depends on how much it's worn and how it's treated. Innovations Designers are bettering the bra through comfort construction and new fabrics, and by evolving the classic style. Here are three innovative options: Champion Double Dry Spot Comfort Gel-cushioned straps don't dig into shoulders. The hook-and-eye closure is padded. $40. Athleta Sprint Seamless Bra Top The style offers smaller-chested women more shape and helps avoid the dreaded "uniboob." There are removable cups for modesty. $48. Moving Comfort Juno The cups are lined with S.Cafe fabric, which is made from recycled coffee grounds. It helps eliminate odor and wick away sweat. $52. Perfect fit Straps: If they're digging in or falling off, something's wrong. Keep in mind that racerback styles can't slip. Cup: Measure around the fullest point of the bust and then subtract the rib cage measurement to determine your cup size. Many women opt for a too-large band and compensate with a too-small cup. Band: Measure the rib cage just under the bust, then add four to get your band size. This should feel more snug than a lingerie bra and fit on the loosest hook. Underwire: Some women refuse to wear underwire for exercise, but it makes the band more secure, which is especially helpful for those with larger chests. Style: Compression bras hug the breasts to the body, while encapsulation bras support each breast separately. The best bets are combos that do both. Online poll What's your biggest annoyance about sports bras? I almost had to call the fire department to get them off. Ask an expert Read the transcript from a reader Q&A with LaJean Lawson, the sports bra blogger for Champion, and MisFits columnist Vicky Hallett.