Small thumbnails

Why are the thumbnails so small in relation to image? see attached

The size of the thumbnails on the product page are set in the CSS of HikaShop. You can go in the config, under the tab display and edit your front end CSS to change the height in that code:

div#hikashop_product_left_part img.hikashop_child_image{
margin : 2px;
height:25px;
}