This feed does not validate.
'utf8' codec can't decode byte 0x9f in position 13778: invalid start byte (maybe a high-bit character?) [help]
line 15, column 2: Undefined item element: g:identifier_exists (137 occurrences) [help]
<g:identifier_exists></g:identifier_exists> ^
line 16, column 12: Invalid value for g:gender: (137 occurrences) [help]
<g:gender></g:gender> ^
line 17, column 2: Undefined item element: g:age_group (137 occurrences) [help]
<g:age_group></g:age_group> ^
line 23, column 2: Undefined item element: g:additional_image_link (97 occurrences) [help]
<g:additional_image_link>http://wwwimages/produ ... ^
line 24, column 2: Undefined item element: g:mpn (137 occurrences) [help]
<g:mpn>HS30</g:mpn> ^
line 25, column 22: Invalid value for g:price: 160,00 EUR (137 occurrences) [help]
<g:price> 160,00 EUR</g:price> ^
line 26, column 2: Undefined item element: g:availability (137 occurrences) [help]
<g:availability>available for order</g:availability> ^
line 28, column 2: Undefined item element: g:shipping_weight (137 occurrences) [help]
<g:shipping_weight>2.00 kg</g:shipping_weight> ^
line 65, column 2: Undefined item element: g:gtin (14 occurrences) [help]
<g:gtin>4260171830028</g:gtin> ^
line 3664, column 8: Missing channel element: description [help]
</item></channel> ^
In addition, interoperability with the widest range of feed readers could be improved by implementing the following recommendations.
Your feed appears to be encoded as "UTF-8", but your server is reporting "US-ASCII" [help]
line 3, column 0: Use of unknown namespace: http://base.google.com/cns/1.0 [help]
<rss version="2.0" xmlns:g="http://base.google.com/ns/1.0" xmlns:c="http://b ...
line 29, column 1: item should contain a guid element (137 occurrences) [help]
</item> ^
line 192, column 98: description contains bad characters (68 occurrences) [help]
... frac14;rzen und Stö�en des Ellenbogens und des Unte ... ^
line 3664, column 8: Missing atom:link with rel="self" [help]
</item></channel> ^