"The Prime Rain Jacket is made to protect you from the rain, without overheating. The 100% waterproofness and high breathability make this jacket a premium choice. The Prime raincoat is made of 100% recycled polyester. The raincoat is completely waterproof and windproof thanks to the Poray 15,000 membrane. (The higher the Poray number, the better the waterproofness.) The taped seams and a fully water-resistant zipper strengthen the waterproofness. The added ventilation panel on the back provides extra comfort during exercise. The Semi 4-Way stretch in the fabric ensures a comfortable fit and extra freedom of movement on the bike. With the Prime Rain Jacket, a shower no longer becomes a burden but a sporting challenge on the bike."