ThirdLove Review: Half-Cup Sizing, the 24/7 Classic T-Shirt Bra and Comfort-First Bras in A–H Cups

ThirdLove’s defining feature is half-cup sizing. Traditional bras jump straight from one cup size to the next, so many women end up with cups that gap slightly in one size and overflow in the next. ThirdLove’s half sizes, such as 34B½ or 36D½, fill that gap, giving a smoother fit across the cup and fewer wrinkles under clothing. Half cups are especially helpful for women whose breasts differ slightly in size, those whose shape has changed after pregnancy or weight changes, and anyone who has never found a bra that fits perfectly. The Find My Fit quiz asks about your current bra size, how it fits, where it gaps or digs in, and your breast shape, then recommends a size and styles. It’s not a replacement for a professional fitting, but many customers find it more helpful than generic size charts. One customer said she was “excited to get the replacement in the perfect size,” showing how often the second try gets it just right.

The 24/7 Classic collection is ThirdLove’s core line and where most buyers start. The 24/7 Classic T-Shirt Bra uses lightweight memory foam cups that mold to your shape, creating a seamless look under T-shirts, knitwear and fitted tops. Its thin, cushioned straps and smooth band are designed for all-day comfort. The Perfect Coverage Bra offers fuller cups for more security and less spillage, the Smooth Minimizer reduces projection by redistributing volume so button-down shirts don’t gape, and the Uplift Plunge adds lift with a lower center for V-necks. The Second Skin Unlined bra gives a natural shape without padding, and the Strapless keeps you supported under off-shoulder outfits. Wireless versions offer the same smooth look without underwire. Customers frequently praise the comfort, with one calling ThirdLove “So comfortable and worth the cost.”

ThirdLove’s ComfortStretch line uses stretchier fabric that flexes with your body, a good fit for people who find traditional bras restrictive or whose size fluctuates during the month. The Back Smoothing T-Shirt Bra has a wider, smooth band that reduces back bulges under fitted tops. The Front Close version is easier to put on, helpful for people with shoulder or mobility limitations, and the Smoothing Full Coverage bra gives maximum security with a sleek finish. Wireless bras like the 24/7 Classic Wireless, Smooth Wireless Minimizer and Zero Edge Wireless Push-Up offer support without underwire, ideal for working from home, travel and long days. Fit isn’t perfect for everyone. One buyer said bras “don’t seem to fit smaller bust unless you are very thin band width,” so smaller-busted shoppers with wider bands may need to compare carefully or try a different style.

ThirdLove’s biggest weakness is its post-purchase experience. Several customers describe returns as frustrating, with one calling it “a nightmare” and others saying they struggled to get “past the AI bot.” Another explained that “each returned order charges a $4.99 processing fee even if you ship multiple orders together in one box.” Discount code glitches also come up: one shopper said her code “disappeared” after editing her cart, though another said live chat agent Clara “retroactively applied my discount.” ThirdLove replies to 100% of negative reviews, typically within a week, and live chat runs from 8:00 AM to 7:00 PM PT, with text support also available. Prices are premium at full price ($68–$78), but frequent sales bring many styles down to around $45–$69. Use the fit quiz carefully, keep receipts, read the return policy before ordering, and ask for a human agent in live chat for anything complex.