Still feel "silk bath" is very wasei-ish.

@@ -11,0 +12 @@
+<xref type="see" seq="2837439">シルクバス</xref>

シルク風呂	1028
シルクバス	617
シルキーバス	576
シルク湯		123
シルキー風呂	72
シルキー湯	21
google images
http://aqua-saison.com/oyu.html
ミクロ単位の超微細な気泡がたっぷり含まれたお湯が、まるで絹の肌触りのように、優しくお肌を包み込む新感覚の「シルク風呂」です。
https://www.lifein.tokyo.jp/en/jonan/topics/detail.php?id=78
"Kaiseiyu’s kuro-yu baths include one that is carbonated, their original Kuroyu-Tansansen onsen.  It also has a regular warm-water bath called the 
Silk Bath, with bubbles so small that the water takes on a whitish appearance. These bubbles help clean the pores of the skin."
http://www.yunomorionsen.com/singapore/onsen/
"SILK BATH
Filled with tiny bubbles, this bath offers a deeply cleansing and relaxing experience. The jets of tiny bubbles not only give the water a sensual, 
silky feel, but also aid buoyancy and stimulate and relax the muscles."

Obviously nobody outside of Japan are calling these "silk bath", but I guess it's a reasonable translation?