Not an obvious sport that you would associate with foot blisters but yes, cyclists, although they are technically a non-weight-bearing sport, do get affected by blisters! Cycling shoes should be tried on at a shop to get a great fit, branding is irrelevant, they should just work for you, internet purchasing for this type (or any other type really) of footwear, can lead to incorrect fitting to the foot. From a Podiatrists perspective the shoe should be neutral as any biomechanical issues can be resolved by prescription orthotics.
The foot in a cycling shoe is kept at the midstance part of the gait cycle and because of that, it is quite unstable but in cycling the foot needs to be more stable and a rigid lever, which could easily be addressed by orthotics. This instability causes movement within the cycling shoe, and too much movement of the foot in the shoe, causes friction, which can cause blisters.
My youngest son, who road bikes tells me `heel blisters are the worst`, caused by when he gets out of the seat and rides uphill and the heel starts to move in the back of the shoe, causing heel blisters. Making sure the shoe is a snug fit but not too tight and that the feet are retained in the shoe are important factors that will prevent too much movement of the foot at the back of the shoe reducing the friction present that causes heel blisters.
Wicking socks are the best for cycling as the feet still sweat and create moisture next to the skin, if there is room in the cycling shoe.
Armaskin liner socks would work really well here for all locations of blisters on the foot.
Engo patches placed in the areas of the shoe that are creating hotspots would reduce any friction caused by the shoe.
Taping the skin with Hypafix and KT Pro tapes are great blister prevention measures along with 2toms blister powder.
Epitact gel ovals and the gel heel sleeves are reusable products to prevent blisters.
It’s just finding what works for you on an individual basis! If you already have a blister, then treat it with dressings that are appropriate to which stage the blister is in.