The 
fleeces are fishing clothes providing warmth and comfort during your outings, especially in colder weather conditions. 
 The reasons to opt for a fleece for fishing:    
Thermal Insulation: Fleeces provide excellent thermal insulation, keeping fishermen warm even in cold conditions. There are several thicknesses, to choose according to the season.   
Lightness and Breathability : They are lightweight and allow the skin to breathe, avoiding overheating during physical activity.   
Versatility: Can be worn alone or as an intermediate layer under a waterproof jacket for additional protection against wind and rain, where a fleece alone will not suffice.    
Comfort: The fleece fabric is soft and comfortable, which is important for long fishing days.
    In this category you will also have fishing softshells, which have a more wind-cutting outer surface, and which can withstand a little rain, even if it is not perfectly waterproof it is more resistant than a normal fleece. The most famous is the 
Fox fleece jacket.  And if the hood or pockets are important features for you, you should rather look towards a 
fishing sweatshirt.