Most women own a sports bra and a swim top. They're bought separately, stored separately, and treated as different garments for different contexts. The Swimm crop top range is designed to make that distinction unnecessary.
Most activewear is built around a single use case. A sports bra for the gym, yoga, or pilates. A swim top for the water. The assumption is that these are different garments because they need to be — different fabrics for different environments.
That assumption is built around synthetics. With merino, it doesn't hold.
Why synthetic fabric forces the split
'Moisture-wicking' is one of activewear's most common claims — but wicking moves perspiration to the fabric's surface, it doesn't manage it. In a high-heat environment or a long session, that surface moisture sits against the skin at the underbust, the back, the waistband — the exact points where a sports bra needs to perform most. It evaporates slowly, if at all.
In water, synthetic fabrics cling. Out of water, they trap heat unevenly and hold odour. They also shed microplastics with every wash and don't biodegrade — a particular irony for a category built around being in and around water.
The sports bra and the swim top exist as separate garments because synthetic fabric can't do both jobs well.
Why merino doesn't have that problem
Merino wool manages moisture differently. It absorbs and releases perspiration gradually — so it handles a training session and water immersion equally well. It doesn't cling when wet. It doesn't trap heat when dry. It regulates temperature naturally in both directions and is inherently odour-resistant — not treated, inherently.
It's also fully biodegradable. Unlike synthetic alternatives, what goes into the water doesn't stay there.
Does merino hold up in chlorine and saltwater?
It's the question most people ask. The short answer is yes — with the right care. Merino is naturally more resilient to chlorine degradation than many synthetics, which break down and lose elasticity over time. A cold rinse after each swim is all it takes to extend the life of the fabric. The same applies to saltwater.
Most synthetic activewear marketed as swim-ready degrades faster than its packaging suggests. Merino, looked after correctly, holds its structure and stretch across both environments.
Two styles, one fabric
The Swimm Gymm to Swimm range includes two crop top styles — both of which work as sports bras, swim tops, or standalone workout tops:
- The racerback crop — higher coverage at the back, suited to higher-impact training and longer swim sessions.
- The scoop back crop — a cleaner line at the back, suited to yoga, pilates, and water where aesthetics matter as much as performance.
Both are built from the same 96/4 merino-elastane blend — knitted for four-way stretch, tested in chlorinated pools, open water, and saunas. One top. No separate sports bra required.