Lululemon unveils adaptive-temperature running vest

Lululemon has introduced the Ventscape PrimaLoft ThermoPlume+ Run Vest, a performance garment designed to help runners maintain thermal comfort in changing conditions without needing to adjust or remove layers. The vest features a patent-pending construction combining lightweight insulation with strategically positioned mesh panels to manage warmth, airflow and moisture during cold-weather running.

The garment uses PrimaLoft ThermoPlume+ insulation to provide warmth at the start of a run, when the body generates less heat. As physical activity increases, strategically placed mesh vents allow air to circulate and release excess heat and humidity from the microclimate around the body.

Lululemon developed the construction in collaboration with athlete ambassadors, using digital modelling, material testing and prototype evaluations to optimise the balance between insulation and ventilation. Testing included thermal mannequin assessments under simulated windy running conditions, alongside more than 250 hours of testing across 2,500 kilometres through laboratory evaluations and outdoor trials.

Lululemon said the development addresses temperature fluctuations experienced during cold-weather exercise, aiming to reduce the need for runners to stop and adjust their clothing. The Ventscape Run Vest is scheduled for a global launch in December 2026, adding to the brand’s technical running apparel range.