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PureForm DefineFit Back Smoothing Unlined Wireless Bra — CoreFlex™

£23.00

£23.00 £23.00

Mid Support

Color

Size

Bust size

UK sizing · noted on your order so we can check your fit ·

Find your size

Two measurements and we'll work out the size to order, plus your band and cup in UK, US and EU.

Underbust Snug around your ribcage, right under your bust cm Bust Around the fullest part, tape level and relaxed cm

Our bras are sized S to 6XL. Use your bust measurement to pick the size, and your band and cup to check the fit.

Which size to order

Size	Bust
XS	78–82 cm31–32 in
S	82–86 cm32–34 in
M	86–90 cm34–35 in
L	90–96 cm35–38 in
XL	96–102 cm38–40 in
2XL	102–110 cm40–43 in
3XL	110–118 cm43–46 in
4XL	118–126 cm46–50 in
5XL	126–134 cm50–53 in
6XL	134–142 cm53–56 in

Band size

Underbust	US / UK	EU
63–67 cm26–27 in	30	65
68–72 cm28–29 in	32	70
73–77 cm30–31 in	34	75
78–82 cm32–33 in	36	80
83–87 cm34–35 in	38	85
88–92 cm36–37 in	40	90
93–97 cm38–39 in	42	95
98–102 cm40–41 in	44	100
103–107 cm42–43 in	46	105
108–112 cm44–45 in	48	110
113–117 cm46–47 in	50	115

Cup size

Bust − underbust	US	UK	EU
2.5 cm1 in	AA	AA	AA
5 cm2 in	A	A	A
7.5 cm3 in	B	B	B
10 cm4 in	C	C	C
12.5 cm5 in	D	D	D
15 cm6 in	DD	DD	E
18 cm7 in	DDD / F	E	F
20 cm8 in	G	F	G
23 cm9 in	H	FF	H
25 cm10 in	I	G	I

Band and cup are a fit reference, not a separate size to order — we note them on your order so we can help if anything needs swapping. US and UK cups match up to D, then differ: a US DDD is a UK E.

Local stock

Fast shipping to the United Kingdom · within 3 business days

Buy two get one Free Add any 3 bras into cart, discount is automatic

The PureForm™ Defineline Back Smoothing Unlined Wireless Bra is a seamless stretch bralette designed for all-day back smoothing and wire-free support. Engineered for a discreet fit under everyday outfits, it targets common concerns like side-spillage and back bulges while maintaining a natural silhouette.

Wire-Free

Supportive seams provide lift and shape

Breathable Unlined Cups

Unlined cups provide a natural lift without any extra padding

Secure Wide Band

Wide underbust band stays securely in place

Adjustable Shoulder Straps

Wide straps can be customized for comfort and style

Front Hook-And-Eye Closure

3-level closure for easy wear with compression control

Smoothing Coverage

High coverage underarms and back for a smoothed-out look

Why you'll love it!
• Targeted Lift & Centering: Side slings and reinforced under-bust weave gather and support the bust without wires.
• Invisible Seamless Fit: 4-way stretch fabric that molds to your curves for a smooth, no-show look.
• No-Dig Wide Straps: Adjustable wide straps to relieve pressure for a custom-to-you fit.
• Stay-Put Wide Band: Extra-wide ribbed hem stays in place all day—no rolling or riding up.
• Back Smoothing: High-coverage wings eliminate side spill and smooth back bulges for a seamless look.
• Easy Front Closure: 3-row front hook-and-eye for quick dressing and a secure, customizable fit.
• Everyday Versatility: Perfect for office wear, running errands, or lounging, providing comfort that lasts from morning to night.

360° Shaped

The fabric effortlessly adapts to your body's contours, providing exceptional comfort and freedom of movement.

Incredibly Soft

Designed to feel gentle against sensitive skin, delivering lasting comfort without irritation.

Ultra Breathable

Moisture-wicking fabric helps keep your skin dry, fresh and comfortable throughout the day.

Keep It Cool

Performance-focused materials help prevent overheating and keep you comfortable for longer.

Size	Bust	Waist	Hips
XS	78–82 cm31–32 in	60–64 cm24–25 in	84–88 cm33–35 in
S	82–86 cm32–34 in	64–68 cm25–27 in	88–92 cm35–36 in
M	86–92 cm34–36 in	68–74 cm27–29 in	92–98 cm36–39 in
L	92–98 cm36–39 in	74–80 cm29–31 in	98–104 cm39–41 in
XL	98–104 cm39–41 in	80–88 cm31–35 in	104–110 cm41–43 in
2XL	104–112 cm41–44 in	88–96 cm35–38 in	110–118 cm43–46 in
3XL	112–120 cm44–47 in	96–104 cm38–41 in	118–126 cm46–50 in
4XL	120–128 cm47–50 in	104–112 cm41–44 in	126–134 cm50–53 in
5XL	128–136 cm50–54 in	112–120 cm44–47 in	134–142 cm53–56 in
6XL	136–144 cm54–57 in	120–128 cm47–50 in	142–150 cm56–59 in

Size	US / CA	UK	AU / NZ	EU	FR	IT
XS	0–2	4–6	4–6	32–34	32–34	36–38
S	4–6	8–10	8–10	36–38	36–38	40–42
M	8–10	12–14	12–14	40–42	40–42	44–46
L	12–14	16–18	16–18	44–46	44–46	48–50
XL	16–18	20–22	20–22	48–50	48–50	52–54
2XL	20–22	24–26	24–26	52–54	52–54	56–58
3XL	24–26	28–30	28–30	56–58	56–58	60–62
4XL	28–30	32–34	32–34	60–62	60–62	64–66
5XL	32–34	36–38	36–38	64–66	64–66	68–70
6XL	36–38	40–42	40–42	68–70	68–70	72–74

Bust − underbust	Cup
7.5–10 cm3–4 in	A
10–12.5 cm4–5 in	B
12.5–15 cm5–6 in	C
15–17.5 cm6–7 in	D
17.5–20 cm7–8 in	DD

Size	Equivalent bra sizes
S	30DD · 32B · 32C · 32D · 34A
M	34B · 34C · 34D · 36A · 36B
L	34DD · 36C · 36D · 38A · 38B
XL	36DD · 38C · 38D · 40B
2XL	38DD · 40C · 40D · 42B
3XL	40DD · 42C · 42D · 44B · 44C
4XL	42DD · 44D · 46B · 46C