isbit breathable at all or does it make you sweat??

breathable.. good cotton..a real bargain.. keep you warm.. good value for money 🌟🌟🌟🌟🌟

Are these tops nice and long? Need something that will tuck right down into trousers and not come untucked when bending down, etc! Thanks.

Yes this top is nice and long I'm a big bloke and play golf most days, I don't have a problem with anything coming untucked. A minor problem is that the neck area is large and quite loose not like my older thermal, however it is warm and fits me fine.

I have Heat Holders usually are they as good ?

Have four of this style and pleased with quality and price. Would recommend you buy at least One size larger than normal. Normally am a Medium found them too tight, next two bought are XL size. Perfect for me and consider myself slim to avarage build. Good Luck.

Are these tops suitable for wearing in bed?

These were originally designed as nightwear thermals but now most homes have the luxury of central heating, or other means of heat, they’re no longer required at night. However they’ve made a come back as under garments. My Father (96) won’t have his bedroom heated and likes the window to always be left on the latch because that’s how his generation was raised, so he sleeps warm, cosy and super comfortably in these. All points you might like to consider when deciding if they’re suitable for your sleep requirements. They’re super good option for camping or motor home trips or for anyone who has to work outdoors all year round. Gone are the times where men would never even admit to owning a pair never mind wearing them!