For stronger four-season tents, one or two support rods are usually added to enable the support system to withstand stronger wind or thicker snowfall.
The shape of the winter tent is usually designed as a sleek dome shape to minimize the flat part on the top of the tent and prevent accumulation of snow.
Of course, these winter/alpine tents are also suitable for relatively mild weather conditions. It's just that the weight of their extra support rods makes them heavier than the three-season account.
