First of all, I want to give you warmth
I gave you a scarf to keep you warm. Everyone has his own life, and it is impossible to stay with each other all the time. I hope that when boys wear this scarf, there will be temperature, just like girls around. I gave this scarf to show my concern for you in case you catch a cold.
Second, I hope you take good care of yourself.
Compared with girls, boys may not be careful about their bodies, so if you are in a long-distance relationship and are far apart, the significance of sending a scarf is to hope that it can bring you the warmth of the sun, just like he is by your side, so that you can keep warm and take care of yourself when it is cold again.
Third, love you forever.
Girls send scarves to boys, not only to let boys take good care of themselves, but also to express their concern for boys, and also to express their eternal love for you. Some girls may not like telling their boyfriends that I love you often, but these girls may sometimes express their love through their own behaviors, such as sending scarves, which also means that they want to surround you and love you all the time, so sending scarves is also an expression of love.
I don't know, am I right? I hope it helps you!