וַיְהִ֣י מִֽמָּחֳרָ֗ת וַיִּקַּ֤ח הַמַּכְבֵּר֙ וַיִּטְבֹּ֣ל בַּמַּ֔יִם וַיִּפְרֹ֥שׂ עַל־פָּנָ֖יו וַיָּמֹ֑ת וַיִּמְלֹ֥ךְ חֲזָהאֵ֖ל תַּחְתָּֽיו׃ (פ)
And it came to pass on the morrow, that he took the coverlet, and dipped it in water, and spread it on his face, so that he died; and Hazael reigned in his stead.
Metzudat Zion
This is a thick covering that was brought from it tassels. This Targum Yonatan as Genucha. this is also in Kings 2: 8:15. "and he took the netted piece of cloth" and Targum Yonatan translates it has Genucha.