For example, if you have a dropdown list and shoppers want to buy 2 items, they have to click on the list and then choose the desired option. If you have quantity selectors, they just have to click on the plus sign.
Yet 61% of sites in our e-commerce UX benchmark make it unnecessarily difficult for users to update the quantity of products by using either only an open text field or a drop-down.
Read more here
Here's also the instruction about the implementation of quantity selectors on Shopify
A bad example from Mavi jeans:
They use a dropdown list for the quantity feature, which is not good UX making shopping difficult for your customers, especially if they like to buy a few items per order.
Not the best example from KKWBeauty:
They also have the quantity feature with minus/plus selectors, but it's much smaller that's why it's not so convenient as on Tinyrituals. But on the other hand, it is not known how often it is used. If often, it is obvious that it is better to make it bigger. If not often, then this option will do.
A good example from Tinyrituals:
They are selling jewelry and some customers can buy more than one item, that's why it's relevant for them to have this feature and they implemented it very well, so it's very easy to increase the quantity on Mobile devices, as plus and minus selectors are so big and easy to tap.
A good example from Puravida
They are selling low-price products and customers can buy several products at once that's why they have so big quantity section with minus / plus buttons. Well done, especially in their niche.
