Umbrella is necessary when the rainy season comes. If I go to buy an umbrella, I would like to buy a two-folding umbrella and in plain color especially black. The reason is I like a small umbrella that can fit inside my bag and I don't need to carry it with one hand. Another important point is, since you keep it in the bag, you can't forget it and carry it back where ever you go. The only problem is with a small umbrella, that it can save you with small rain but not heavy rain. You can't come out with a small umbrella if there is heavy rain. Especially, if you are living in a city like Mumbai, you must have a long handle umbrella that can be used as a stick when roads get flooded. Actually, during heavy rain and water logging, the road's manholes get open so that water can come down. In this situation, you never know where the manholes due to water it is not visible. In such cases, long handle umbrella is life-saving.
So, before we buy an umbrella, we should know how this can help us and accordingly we can buy. More than its color and size, how useful it can be, that we need to look after.