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Cosari
Cosari StayLift 3D
Free tracked shipping to the US
- Wireless lift for A to DD cups
- 0.8mm edge, invisible under silk
- Converts to 5 strap styles
- Free tracked shipping to the US · delivery times
- 30-day returns · refund policy
- Secure checkout · card, Apple Pay, Google Pay, Shop Pay, PayPal
- Questions? contact@cosarit.com · Mon–Fri 9–17 ET
Features

Molded W-Cradle Cups
Inside each cup, graduated foam and a flexible W-shaped cradle lift from beneath the bust. Tiny ventilation pores in the lining let air through so you don't overheat.

Wide Wing and 4×4 Hooks
A 10.5cm laser-cut back wing spreads tension evenly to smooth your back, and the 4-row by 4-column hook closure lets you set the exact snugness you need.
Packs Without Denting
No wire means the cups flex and spring back. Crush it into a carry-on and it comes out in shape.
Smooth From Every Angle
The 10.5cm back wing lies flat instead of cutting in, so there's no back roll under fitted dresses.
One Bra, Five Ways
Detachable straps clip on in seconds for strapless, classic, halter, crisscross, or one-shoulder wear.
Zero Downward Slip
Two 12mm wavy silicone bands along the top and bottom edges grip by friction, not glue, so they keep holding when you sweat.
Wireless 3D Lift
A flexible W-shaped cradle molded into each cup lifts from underneath for a rounded, separated shape with no metal wire.
0.8mm Invisible Edge
Laser-cut, stitch-free top edges lie flat under bias-cut silk and ribbed knits, and stay flat wash after wash.
Breathable Cups
140 micro-ventilation pores in each cup let heat escape, so it stays comfortable through long summer events.
How to use it
- 1
Set Your Fit
Fasten the 4-row hook closure on the column that feels snug but comfortable. It should sit level and firm without pinching.
- 2
Choose Your Style
Unclip the straps for strapless wear, or clip them on for halter, crisscross, one-shoulder, or classic.
- 3
Get Dressed and Forget It
Slip on your dress. The silicone bands hold it in place, so you can go the whole night without adjusting.
In the box
- 1 × Cosari StayLift 3D Wireless Strapless Bra
- 1 × Pair of matching matte convertible straps
- 1 × Pair of clear formal straps
- 1 × Matching 4-hook back-band extender
Care & safety
- Hand wash or machine wash cold in a mesh bag on a delicates cycle. Never use fabric softener, as it coats the silicone and reduces grip.
- Lay flat to dry away from direct heat. Do not tumble dry, iron, or bleach. If the silicone ever feels less tacky, rinse it with lukewarm water and mild soap to restore grip.
Specifications
- Weight
- 82 g
- Top Edge
- 0.8mm laser-cut, stitch-free
- Back Wing Width
- 10.5 cm
- Cup Ventilation
- 140 micro-pores per cup
- Closure
- 4-row × 4-column hook-and-eye
- Sizes
- S (32A–32C) to 2XL (40C–42DD)
- Shades
- Champagne Nude, Espresso, Obsidian Black
Questions
How do I pick the right size?
Sizes run from S (32A–32C) to 2XL (40C–42DD). Check the size chart against your usual bra size. If you're between bands, the 4-column hook closure and the included extender let you fine-tune the fit.
Is it heavily padded?
No. The foam is about 6mm at the bottom of the cup for lift and tapers to a 0.8mm edge at the top, so the shape looks natural rather than push-up.
Does it come with straps?
Yes. Each order includes a pair of matching matte convertible straps and a pair of clear straps, so you can wear it strapless, classic, halter, crisscross, or one-shoulder.
Can I wear it with an open-back dress?
It works with most backs, but the 10.5cm back wing means it isn't suited to very low open-back gowns cut down near the tailbone.
How much is shipping?
Shipping to the US is free and tracked. You get a tracking number by email when your order ships. See the shipping policy for delivery times.
Can I return it?
Yes, within 30 days of delivery. Details are in our refund policy.
Who sells this product?
Cosari is run by Interactive Ecommerce LLC, Sheridan, Wyoming. Questions: contact@cosarit.com, Monday to Friday, 9:00–17:00 ET.
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