This top is a combination of Spandex (10%) and polypropylene (90%) offering a perfect layering material. Normal Lycra rash tops are cooling layers designed to cool the body, this top has the outward appearance of a Lycra top but has a brushed 'fleece like' inside to provide good thermal qualities. It also remains remarkably dry since the polypropylene material hates water. Wear it under neoprene wetsuits, or Dry Suit....... it would be great under your ski suit, down the gym, cycling etc.
From personal experience they are great for cycling in cold weather but you need a windproof outer layer.