Inner Sling
Inner Sling
A supportive panel inside the bra cup that lifts and positions the breast, common in full-bust and minimizer bras.
What Is an Inner Sling?
An inner sling is a secondary fabric panel hidden inside a bra cup that acts as an internal hammock for the breast tissue. It is typically made from firm power mesh, sturdy microfibre, or a non-stretch woven material, and it is sewn into the lower and side portions of the cup. The sling attaches to the underwire casing at the bottom, wraps upward and inward, and anchors at the cup's inner edge near the gore. The outer cup fabric — which may be lace, embroidery, or sheer mesh — sits over the sling as the decorative layer.
The inner sling transforms how a bra performs on larger busts. Without a sling, the outer cup fabric bears the full weight of the breast, which causes stretching, sagging, and loss of shape over time. With a sling, the internal panel carries the load while the outer cup remains purely decorative. This means a full-bust bra can use delicate lace or sheer mesh on the outside without sacrificing support — the sling does the heavy lifting underneath.
When evaluating inner sling construction, open the cup and look inside. The sling panel should be clearly visible as a separate layer of firmer fabric anchored at the lower cup and sides. It should cover at least the bottom third of the cup interior. The fabric should feel smooth and substantial, not flimsy. On a well-made bra, the sling's edges are encased in soft binding so they do not create ridges visible through the outer cup.
Sinderella incorporates inner sling construction in bra sets designed for fuller figures, so the decorative outer cup stays beautiful while the hidden sling provides unwavering lift.
How to Wear & Style
If you are a D-cup or above and have noticed that lace bras lose their shape quickly or the cups stretch out, look specifically for bras with an inner sling — they will maintain their lift and silhouette far longer than single-layer cups. When gifting for a fuller-busted partner, inner sling bras allow you to choose a beautiful, decorative lace design without worrying that style comes at the expense of support. The sling is invisible from the outside, so the bra looks just as luxurious as an unlined design.
Bras with Inner Sling Support
Hidden internal panels that lift and shape, so the outer cup can be as decorative as you like.
Browse Bra SetsFrequently Asked Questions
What is an inner sling?
A supportive panel inside the bra cup that lifts and positions the breast, common in full-bust and minimizer bras.
How does an inner sling differ from an underwire?
An underwire is a rigid C-shaped wire that sits beneath the cup and defines its shape along the base. An inner sling is a fabric panel inside the cup that cradles and lifts the breast tissue from below and the side. The two work together — the wire provides the structural frame, while the sling positions the tissue within that frame for a rounder, more centred silhouette.
Can I feel the inner sling when wearing the bra?
A well-constructed inner sling is made from smooth power mesh or microfibre that blends seamlessly with the cup lining. You should not feel a distinct edge or ridge. If the sling creates a visible line through the cup fabric or digs into tissue, the bra may be the wrong size or the sling construction is poor.