What sort of breaks are we talking here? How about the heat that is generated from the machines and equipment on which you are asked to work as part of your job role? Definitely you would not be able to withstand the heat that is generated out of some machines. In such situations, you may feel to take a break for some time and this may reduce your work time and thus eventually you would be paid less. If you want to cover more time then you may have to stay late by which your personal commitments might be in trouble.
However, if you are not ready to work to cover complete shift hours, then you may have to accept less salary towards the month end which may not be an acceptable or digestible thing for you. Also, there is a chance that you may not be allowed to work beyond the shift timings in some of the jobs and hence though you may want to extend you would not be allowed to do so. You may have to continue with the whole of the next shift and it does mean that you would be in the work location for almost 16 hours which is double the regular shift hours. Hence it is suggested that you buy the best work boots today that would keep you safe from the heat that is generated by the machines.
Now with these boots you could simply continue to work as long as you are asked to do or as long as you feel comfortable to work. As you do not take any breaks you may be considered for a good hike in the next appraisal cycle. Keeping in view these benefits you should better buy the work boots than to ignore the suggestion to buy them.