The rainCap is modeled after their standard cycling cap, except using Assos's proprietary water resistant Triton fabric. The Triton's secret to success in inclement weather is simple. The membrane opens up when it is warm from the temperature created by your head to let perspiration escape. Conversely, when it is colder, the membrane pores shrink to become more water resistant. All seams are taped, so no water will seep in unexpectedly. The cap fits perfectly under your helmet and doubles as a wind deterrent. This cap is the perfect complement to the other wet weather gear offered by Assos. Availible in black only, choose from Size I or II.