Conclusion on Different Materials

About this learning series

Parashath Noah, Laws of Ziziyoth, Page 12-13: 

1. (continued) It should further be realised that an objection can be raised against all fabrics of this second category, in that some Authorities (Ba'al Ha'Ittur and Bah) are of the opinion that one may only recite a berachah over a woolen tallith which has woolen ziziyoth.  Although the final ruling does not follow that opinion, it should, nevertheless, be taken into account when deciding what sort of tallith is best to buy.

The third class of tallith is where the fabric of the tallith is woven from wool and some other material (i.e. the warp is of one sort of material, and the weft is of another).  A tallith of this type is particularly problematic since, according to those Authorities {R. Me'ir z'l, et al.} who rule that ziziyoth must be of the same material as the tallith, it is impossible to affix ziziyoth at all.  Here again {as in the case of a silk tallith}, we must rely on the opinion of Maran z'l, and at least fulfill the mizwah according to one view.

In conclusion, every G-d-fearing person should wear a woolen tallith (both tallith gadhol and tallith qatan), with woolen ziziyoth.  In this way it is possible to comply with the Torah obligation according to all views.

This learning should be in memory of Maran, HaRav HaGaon Ovadia Yosef, ztz'l.