J Cup Bras

The J cup is one of the deepest sizes in our full bust bras range. At this level, the difference between your bust and underbust measurements is significant, which calls for a specific construction (sturdy underwire, wide straps, multi-panel cups) to distribute weight properly and avoid discomfort. At Sans Complexe Paris, it's our bestseller Arum that covers this cup size, available in several colours and as a set. To check your exact size, our bra size guide remains the go-to reference: cup size is calculated from the difference between your two measurements, not from guesswork.

The Arum full cup bra, our J cup reference

The brand's historic bestseller, Arum is available from B to J cup in black, white, skin-tone, royal blue and magenta purple lace, as well as in 2- or 3-piece sets. Its 3-panel construction (three pieces of fabric assembled on each cup, rather than a single moulded piece) shapes more precisely to a fuller bust. The tulle lining reinforces support without adding bulk, and the satin lacing between the cups along with the wide, adjustable satin straps complete a piece certified to OEKO-TEX Standard 100.

Reinforced support thanks to the underwire and full cup shape

In a J cup, the underwire is no small detail: it's what stops the fabric from sagging over the course of the day. Paired with the full cup shape, which structures each breast separately (unlike a balcony or bandeau style), it stabilises a substantial volume without creating pressure points on the back or shoulders — provided the straps are wide enough. That's the case with Arum.

Available in black, white and skin-tone lace

The stretch lace moulds to the shape of the cup while keeping sheer floral detailing and a scalloped-effect trim. The white colourway in particular works well for an occasion such as a wedding: worn under a fitted dress, it avoids the bulky look that a less technical cup can create.

Why full cup is the best-suited shape for the J cup

Beyond an H cup, a full cup bra becomes almost essential. It distributes a substantial volume without shifting all the weight onto the straps or back, which a balcony or bandeau style handles less well. That's why Arum, our only reference available in a J cup, relies on this construction rather than a lighter shape.

Enveloping support designed for deep cups

The deeper the cup, the higher the risk of spillage at the sides or above the cup if the fit isn't right. Arum's 3-panel construction fully envelops the breast, even at the deepest cup sizes such as J — unlike an I cup bra, which can make do with a lighter construction.

Arum's underwire, reinforced everyday support

Arum's underwire is paired with side reinforcements that limit rubbing and sagging at the sides — a common concern with deep cups by the end of the day. Discover our full range of full bust lingerie, designed to flatter every fuller bust.