More Info:

https://www.ssga.com/us/en/institutional/etfs/funds/the-materials-select-sector-spdr-fund-xlb

UCITS Version:

XLBS Invesco Materials S&P US Select Sector UCITS ETF (London Stock Exchange)

Select Sector ETF:

XLP
XLRE
XLC
XLE
XLU
XLB
XLF
XLY
XLV
XLI
XTN
XLK

Select Factor ETF:

QQQ
IVE
MTUM
 
EEM
IWM
RSP
EFA
IVW
MDY
DIA
 

Select Asset Class ETF:

SPY
GLD
 
TLT
DBC